Remove artifact graph mind maps (#5349)

* Remove artifact graph mind maps

* Delete mind map snap files

docs/kcl/helix.md

@@ -33,7 +33,14 @@ helix(revolutions: number, angle_start: number, ccw?: bool, radius: number, axis
 
 ```js
 // Create a helix around the Z axis.
-helixPath = helix(angleStart = 0, ccw = true, revolutions = 5, length = 10, radius = 5, axis = 'Z')
+helixPath = helix(
+  angleStart = 0,
+  ccw = true,
+  revolutions = 5,
+  length = 10,
+  radius = 5,
+  axis = 'Z',
+)
 
 // Create a spring by sweeping around the helix path.
 springSketch = startSketchOn('YZ')
@@ -49,7 +56,14 @@ helper001 = startSketchOn('XZ')
   |> startProfileAt([0, 0], %)
   |> line(end = [0, 10], tag = $edge001)
 
-helixPath = helix(angleStart = 0, ccw = true, revolutions = 5, length = 10, radius = 5, axis = edge001)
+helixPath = helix(
+  angleStart = 0,
+  ccw = true,
+  revolutions = 5,
+  length = 10,
+  radius = 5,
+  axis = edge001,
+)
 
 // Create a spring by sweeping around the helix path.
 springSketch = startSketchOn('XY')
@@ -61,12 +75,19 @@ springSketch = startSketchOn('XY')
 
 ```js
 // Create a helix around a custom axis.
-helixPath = helix(angleStart = 0, ccw = true, revolutions = 5, length = 10, radius = 5, axis = {
+helixPath = helix(
+  angleStart = 0,
+  ccw = true,
+  revolutions = 5,
+  length = 10,
+  radius = 5,
+  axis = {
   custom = {
     axis = [0, 0, 1.0],
     origin = [0, 0.25, 0]
   }
-})
+},
+)
 
 // Create a spring by sweeping around the helix path.
 springSketch = startSketchOn('XY')

docs/kcl/patternCircular2d.md

@@ -9,7 +9,7 @@ Repeat a 2-dimensional sketch some number of times along a partial or
 complete circle some specified number of times. Each object may additionally be rotated along the circle, ensuring orentation of the solid with respect to the center of the circle is maintained.
 
 ```js
-patternCircular2d(data: CircularPattern2dData, sketch_set: SketchSet) -> [Sketch]
+patternCircular2d(sketch_set: SketchSet, instances: integer, center: [number], arc_degrees: number, rotate_duplicates: bool, use_original?: bool) -> [Sketch]
 ```
 
 
@@ -17,8 +17,12 @@ patternCircular2d(data: CircularPattern2dData, sketch_set: SketchSet) -> [Sketch
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `data` | [`CircularPattern2dData`](/docs/kcl/types/CircularPattern2dData) | Data for a circular pattern on a 2D sketch. | Yes |
-| `sketch_set` | [`SketchSet`](/docs/kcl/types/SketchSet) | A sketch or a group of sketches. | Yes |
+| `sketch_set` | [`SketchSet`](/docs/kcl/types/SketchSet) | Which sketch(es) to pattern | Yes |
+| `instances` | `integer` | The number of total instances. Must be greater than or equal to 1. This includes the original entity. For example, if instances is 2, there will be two copies -- the original, and one new copy. If instances is 1, this has no effect. | Yes |
+| `center` | `[number]` | The center about which to make the pattern. This is a 2D vector. | Yes |
+| `arc_degrees` | `number` | The arc angle (in degrees) to place the repetitions. Must be greater than 0. | Yes |
+| `rotate_duplicates` | `bool` | Whether or not to rotate the duplicates as they are copied. | Yes |
+| `use_original` | `bool` | If the target was sketched on an extrusion, setting this will use the original sketch as the target, not the entire joined solid. Defaults to false. | No |
 
 ### Returns
 
@@ -34,12 +38,12 @@ exampleSketch = startSketchOn('XZ')
   |> line(end = [-1, 0])
   |> line(end = [0, -5])
   |> close()
-  |> patternCircular2d({
+  |> patternCircular2d(
        center = [0, 0],
        instances = 13,
        arcDegrees = 360,
-       rotateDuplicates = true
-     }, %)
+       rotateDuplicates = true,
+     )
 
 example = extrude(exampleSketch, length = 1)
 ```

docs/kcl/patternLinear2d.md

@@ -9,7 +9,7 @@ Repeat a 2-dimensional sketch along some dimension, with a dynamic amount
 of distance between each repetition, some specified number of times.
 
 ```js
-patternLinear2d(data: LinearPattern2dData, sketch_set: SketchSet, use_original?: bool) -> [Sketch]
+patternLinear2d(sketch_set: SketchSet, instances: integer, distance: number, axis: [number], use_original?: bool) -> [Sketch]
 ```
 
 
@@ -17,9 +17,11 @@ patternLinear2d(data: LinearPattern2dData, sketch_set: SketchSet, use_original?:
 
 | Name | Type | Description | Required |
 |----------|------|-------------|----------|
-| `data` | [`LinearPattern2dData`](/docs/kcl/types/LinearPattern2dData) | Data for a linear pattern on a 2D sketch. | Yes |
-| `sketch_set` | [`SketchSet`](/docs/kcl/types/SketchSet) | A sketch or a group of sketches. | Yes |
-| `use_original` | `bool` |  | No |
+| `sketch_set` | [`SketchSet`](/docs/kcl/types/SketchSet) | The sketch(es) to duplicate | Yes |
+| `instances` | `integer` | The number of total instances. Must be greater than or equal to 1. This includes the original entity. For example, if instances is 2, there will be two copies -- the original, and one new copy. If instances is 1, this has no effect. | Yes |
+| `distance` | `number` | Distance between each repetition. Also known as 'spacing'. | Yes |
+| `axis` | `[number]` | The axis of the pattern. A 2D vector. | Yes |
+| `use_original` | `bool` | If the target was sketched on an extrusion, setting this will use the original sketch as the target, not the entire joined solid. Defaults to false. | No |
 
 ### Returns
 
@@ -31,11 +33,7 @@ patternLinear2d(data: LinearPattern2dData, sketch_set: SketchSet, use_original?:
 ```js
 exampleSketch = startSketchOn('XZ')
   |> circle({ center = [0, 0], radius = 1 }, %)
-  |> patternLinear2d({
-       axis = [1, 0],
-       instances = 7,
-       distance = 4
-     }, %)
+  |> patternLinear2d(axis = [1, 0], instances = 7, distance = 4)
 
 example = extrude(exampleSketch, length = 1)
 ```

docs/kcl/sweep.md

@@ -59,7 +59,14 @@ sweepSketch = startSketchOn('XY')
 
 
 // Create a helix around the Z axis.
-helixPath = helix(angleStart = 0, ccw = true, revolutions = 4, length = 10, radius = 5, axis = 'Z')
+helixPath = helix(
+  angleStart = 0,
+  ccw = true,
+  revolutions = 4,
+  length = 10,
+  radius = 5,
+  axis = 'Z',
+)
 
 // Create a spring by sweeping around the helix path.
 springSketch = startSketchOn('YZ')

docs/kcl/types/EnvironmentRef.md

@@ -0,0 +1,16 @@
+---
+title: "EnvironmentRef"
+excerpt: ""
+layout: manual
+---
+
+
+[`SnapshotRef`](/docs/kcl/types/SnapshotRef)
+
+
+
+
+
+
+
+

docs/kcl/types/KclValue.md

@@ -311,7 +311,7 @@ Data for an imported geometry.
 | Property | Type | Description | Required |
 |----------|------|-------------|----------|
 | `type` |enum: `Function`|  | No |
-| `memory` |[`ProgramMemory`](/docs/kcl/types/ProgramMemory)| Any KCL value. | No |
+| `memory` |[`EnvironmentRef`](/docs/kcl/types/EnvironmentRef)| Any KCL value. | No |
 | `__meta` |`[` [`Metadata`](/docs/kcl/types/Metadata) `]`|  | No |
 
 
@@ -351,6 +351,23 @@ Data for an imported geometry.
 
 ----
 
+**Type:** `object`
+
+
+
+
+
+## Properties
+
+| Property | Type | Description | Required |
+|----------|------|-------------|----------|
+| `type` |enum: `Tombstone`|  | No |
+| `value` |`null`|  | No |
+| `__meta` |`[` [`Metadata`](/docs/kcl/types/Metadata) `]`|  | No |
+
+
+----
+
 
 
 

docs/kcl/types/ProgramMemory.md

@@ -17,6 +17,5 @@ layout: manual
 |----------|------|-------------|----------|
 | `environments` |`[` [`Environment`](/docs/kcl/types/Environment) `]`|  | No |
 | `currentEnv` |`integer`|  | No |
-| `return` |[`KclValue`](/docs/kcl/types/KclValue)|  | No |
 
 

docs/kcl/types/SnapshotRef.md

@@ -0,0 +1,16 @@
+---
+title: "SnapshotRef"
+excerpt: "An index pointing to a snapshot within a specific (unspecified) environment."
+layout: manual
+---
+
+An index pointing to a snapshot within a specific (unspecified) environment.
+
+**Type:** `integer` (`uint`)
+
+
+
+
+
+
+

e2e/playwright/point-click.spec.ts

@@ -1117,13 +1117,14 @@ openSketch = startSketchOn('XY')
   }) => {
     // One dumb hardcoded screen pixel value
     const testPoint = { x: 620, y: 257 }
-    const expectedOutput = `helix001 = helix(revolutions = 1, angleStart = 360, counterClockWise = false, radius = 5, axis = 'X', length = 5)`
+    const expectedOutput = `helix001 = helix(  revolutions = 1,  angleStart = 360,  counterClockWise = false,  radius = 5,  axis = 'X',  length = 5,)`
+    const expectedLine = `revolutions=1,`
 
     await homePage.goToModelingScene()
 
-    await test.step(`Look for the red of the default plane`, async () => {
-      await scene.expectPixelColor([96, 52, 52], testPoint, 15)
-    })
+    // await test.step(`Look for the red of the default plane`, async () => {
+    //   await scene.expectPixelColor([96, 52, 52], testPoint, 15)
+    // })
     await test.step(`Go through the command bar flow`, async () => {
       await toolbar.helixButton.click()
       await cmdBar.expectState({
@@ -1154,7 +1155,7 @@ openSketch = startSketchOn('XY')
       await editor.expectEditor.toContain(expectedOutput)
       await editor.expectState({
         diagnostics: [],
-        activeLines: [expectedOutput],
+        activeLines: [expectedLine],
         highlightedCode: '',
       })
       // Red plane is now gone, white helix is there

e2e/playwright/regression-tests.spec.ts

@@ -192,11 +192,11 @@ extrude001 = extrude(sketch001, length = 50)
   |> line(end = [0, -1])
   |> close()
   |> extrude(length = 1)
-  |> patternLinear3d({
-        axis: [1, 0, 1],
-        repetitions: 3,
-        distance: 6
-      }, %)`
+  |> patternLinear3d(
+        axis = [1, 0, 1],
+        repetitions = 3,
+        distance = 6,
+      )`
       )
     })
     await page.setBodyDimensions({ width: 1000, height: 500 })

package.json

@@ -85,7 +85,7 @@
     "fmt": "prettier --write ./src *.ts *.json *.js ./e2e ./packages",
     "fmt-check": "prettier --check ./src *.ts *.json *.js ./e2e ./packages",
     "fetch:wasm": "./get-latest-wasm-bundle.sh",
-    "fetch:samples": "echo \"Fetching latest KCL samples...\" && curl -o public/kcl-samples-manifest-fallback.json https://raw.githubusercontent.com/KittyCAD/kcl-samples/achalmers/kw-appearance/manifest.json",
+    "fetch:samples": "echo \"Fetching latest KCL samples...\" && curl -o public/kcl-samples-manifest-fallback.json https://raw.githubusercontent.com/KittyCAD/kcl-samples/achalmers/kw-pattern/manifest.json",
     "isomorphic-copy-wasm": "(copy src/wasm-lib/pkg/wasm_lib_bg.wasm public || cp src/wasm-lib/pkg/wasm_lib_bg.wasm public)",
     "build:wasm-dev": "yarn wasm-prep && (cd src/wasm-lib && wasm-pack build --dev --target web --out-dir pkg && cargo test -p kcl-lib export_bindings) && yarn isomorphic-copy-wasm && yarn fmt",
     "build:wasm": "yarn wasm-prep && cd src/wasm-lib && wasm-pack build --release --target web --out-dir pkg && cargo test -p kcl-lib export_bindings && cd ../.. && yarn isomorphic-copy-wasm && yarn fmt",

src/clientSideScene/ClientSideSceneComp.tsx

@@ -31,7 +31,6 @@ import {
   recast,
   defaultSourceRange,
   resultIsOk,
-  ProgramMemory,
   topLevelRange,
 } from 'lang/wasm'
 import { CustomIcon, CustomIconName } from 'components/CustomIcon'
@@ -425,7 +424,7 @@ export async function deleteSegment({
   modifiedAst = deleteSegmentFromPipeExpression(
     dependentRanges,
     modifiedAst,
-    kclManager.programMemory,
+    kclManager.variables,
     codeManager.code,
     pathToNode
   )
@@ -439,8 +438,8 @@ export async function deleteSegment({
   const testExecute = await executeAst({
     ast: modifiedAst,
     engineCommandManager: engineCommandManager,
-    // We make sure to send an empty program memory to denote we mean mock mode.
-    programMemoryOverride: ProgramMemory.empty(),
+    isMock: true,
+    usePrevMemory: false,
   })
   if (testExecute.errors.length) {
     toast.error('Segment tag used outside of current Sketch. Could not delete.')
@@ -675,7 +674,7 @@ const ConstraintSymbol = ({
                 shallowPath,
                 argPosition,
                 kclManager.ast,
-                kclManager.programMemory
+                kclManager.variables
               )
 
               if (!transform) return

src/clientSideScene/sceneEntities.ts

@@ -47,7 +47,6 @@ import {
   PathToNode,
   PipeExpression,
   Program,
-  ProgramMemory,
   recast,
   Sketch,
   Solid,
@@ -61,6 +60,7 @@ import {
   SourceRange,
   topLevelRange,
   CallExpressionKw,
+  VariableMap,
 } from 'lang/wasm'
 import { calculate_circle_from_3_points } from '../wasm-lib/pkg/wasm_lib'
 import {
@@ -158,7 +158,6 @@ type Vec3Array = [number, number, number]
 export class SceneEntities {
   engineCommandManager: EngineCommandManager
   scene: Scene
-  sceneProgramMemory: ProgramMemory = ProgramMemory.empty()
   activeSegments: { [key: string]: Group } = {}
   intersectionPlane: Mesh | null = null
   axisGroup: Group | null = null
@@ -502,29 +501,25 @@ export class SceneEntities {
     selectionRanges?: Selections
   }): Promise<{
     truncatedAst: Node<Program>
-    programMemoryOverride: ProgramMemory
     sketch: Sketch
     variableDeclarationName: string
   }> {
-    const prepared = this.prepareTruncatedMemoryAndAst(
+    const prepared = this.prepareTruncatedAst(
       sketchPathToNode || [],
       maybeModdedAst
     )
     if (err(prepared)) return Promise.reject(prepared)
-    const { truncatedAst, programMemoryOverride, variableDeclarationName } =
-      prepared
+    const { truncatedAst, variableDeclarationName } = prepared
 
     const { execState } = await executeAst({
       ast: truncatedAst,
       engineCommandManager: this.engineCommandManager,
-      // We make sure to send an empty program memory to denote we mean mock mode.
-      programMemoryOverride,
+      isMock: true,
     })
-    const programMemory = execState.memory
     const sketch = sketchFromPathToNode({
       pathToNode: sketchPathToNode,
       ast: maybeModdedAst,
-      programMemory,
+      variables: execState.variables,
     })
     if (err(sketch)) return Promise.reject(sketch)
     if (!sketch) return Promise.reject('sketch not found')
@@ -532,11 +527,9 @@ export class SceneEntities {
     if (!isArray(sketch?.paths))
       return {
         truncatedAst,
-        programMemoryOverride,
         sketch,
         variableDeclarationName,
       }
-    this.sceneProgramMemory = programMemory
     const group = new Group()
     position && group.position.set(...position)
     group.userData = {
@@ -684,7 +677,6 @@ export class SceneEntities {
 
     return {
       truncatedAst,
-      programMemoryOverride,
       sketch,
       variableDeclarationName,
     }
@@ -733,7 +725,7 @@ export class SceneEntities {
     const variableDeclarationName = _node1.node?.declaration.id?.name || ''
 
     const sg = sketchFromKclValue(
-      kclManager.programMemory.get(variableDeclarationName),
+      kclManager.variables[variableDeclarationName],
       variableDeclarationName
     )
     if (err(sg)) return Promise.reject(sg)
@@ -742,7 +734,7 @@ export class SceneEntities {
     const index = sg.paths.length // because we've added a new segment that's not in the memory yet, no need for `-1`
     const mod = addNewSketchLn({
       node: _ast,
-      programMemory: kclManager.programMemory,
+      variables: kclManager.variables,
       input: {
         type: 'straight-segment',
         to: lastSeg.to,
@@ -761,8 +753,7 @@ export class SceneEntities {
     if (shouldTearDown) await this.tearDownSketch({ removeAxis: false })
     sceneInfra.resetMouseListeners()
 
-    const { truncatedAst, programMemoryOverride, sketch } =
-      await this.setupSketch({
+    const { truncatedAst, sketch } = await this.setupSketch({
       sketchPathToNode,
       forward,
       up,
@@ -801,7 +792,7 @@ export class SceneEntities {
           ])
           modifiedAst = addCallExpressionsToPipe({
             node: kclManager.ast,
-            programMemory: kclManager.programMemory,
+            variables: kclManager.variables,
             pathToNode: sketchPathToNode,
             expressions: [
               lastSegment.type === 'TangentialArcTo'
@@ -817,7 +808,7 @@ export class SceneEntities {
           if (trap(modifiedAst)) return Promise.reject(modifiedAst)
           modifiedAst = addCloseToPipe({
             node: modifiedAst,
-            programMemory: kclManager.programMemory,
+            variables: kclManager.variables,
             pathToNode: sketchPathToNode,
           })
           if (trap(modifiedAst)) return Promise.reject(modifiedAst)
@@ -867,7 +858,7 @@ export class SceneEntities {
 
           const tmp = addNewSketchLn({
             node: kclManager.ast,
-            programMemory: kclManager.programMemory,
+            variables: kclManager.variables,
             input: {
               type: 'straight-segment',
               from: [lastSegment.to[0], lastSegment.to[1]],
@@ -908,7 +899,6 @@ export class SceneEntities {
           sketchPathToNode,
           draftInfo: {
             truncatedAst,
-            programMemoryOverride,
             variableDeclarationName,
           },
         })
@@ -949,7 +939,7 @@ export class SceneEntities {
     if (trap(pResult) || !resultIsOk(pResult)) return Promise.reject(pResult)
     _ast = pResult.program
 
-    const { programMemoryOverride, truncatedAst } = await this.setupSketch({
+    const { truncatedAst } = await this.setupSketch({
       sketchPathToNode,
       forward,
       up,
@@ -982,13 +972,10 @@ export class SceneEntities {
         const { execState } = await executeAst({
           ast: truncatedAst,
           engineCommandManager: this.engineCommandManager,
-          // We make sure to send an empty program memory to denote we mean mock mode.
-          programMemoryOverride,
+          isMock: true,
         })
-        const programMemory = execState.memory
-        this.sceneProgramMemory = programMemory
         const sketch = sketchFromKclValue(
-          programMemory.get(variableDeclarationName),
+          execState.variables[variableDeclarationName],
           variableDeclarationName
         )
         if (err(sketch)) return Promise.reject(sketch)
@@ -1045,15 +1032,12 @@ export class SceneEntities {
         const { execState } = await executeAst({
           ast: _ast,
           engineCommandManager: this.engineCommandManager,
-          // We make sure to send an empty program memory to denote we mean mock mode.
-          programMemoryOverride,
+          isMock: true,
         })
-        const programMemory = execState.memory
 
         // Prepare to update the THREEjs scene
-        this.sceneProgramMemory = programMemory
         const sketch = sketchFromKclValue(
-          programMemory.get(variableDeclarationName),
+          execState.variables[variableDeclarationName],
           variableDeclarationName
         )
         if (err(sketch)) return
@@ -1104,7 +1088,7 @@ export class SceneEntities {
     if (trap(pResult) || !resultIsOk(pResult)) return Promise.reject(pResult)
     _ast = pResult.program
 
-    const { programMemoryOverride, truncatedAst } = await this.setupSketch({
+    const { truncatedAst } = await this.setupSketch({
       sketchPathToNode,
       forward,
       up,
@@ -1144,13 +1128,10 @@ export class SceneEntities {
         const { execState } = await executeAst({
           ast: truncatedAst,
           engineCommandManager: this.engineCommandManager,
-          // We make sure to send an empty program memory to denote we mean mock mode.
-          programMemoryOverride,
+          isMock: true,
         })
-        const programMemory = execState.memory
-        this.sceneProgramMemory = programMemory
         const sketch = sketchFromKclValue(
-          programMemory.get(variableDeclarationName),
+          execState.variables[variableDeclarationName],
           variableDeclarationName
         )
         if (err(sketch)) return Promise.reject(sketch)
@@ -1210,15 +1191,12 @@ export class SceneEntities {
           const { execState } = await executeAst({
             ast: _ast,
             engineCommandManager: this.engineCommandManager,
-            // We make sure to send an empty program memory to denote we mean mock mode.
-            programMemoryOverride,
+            isMock: true,
           })
-          const programMemory = execState.memory
 
           // Prepare to update the THREEjs scene
-          this.sceneProgramMemory = programMemory
           const sketch = sketchFromKclValue(
-            programMemory.get(variableDeclarationName),
+            execState.variables[variableDeclarationName],
             variableDeclarationName
           )
           if (err(sketch)) return
@@ -1605,7 +1583,7 @@ export class SceneEntities {
     // do a quick mock execution to get the program memory up-to-date
     await kclManager.executeAstMock(_ast)
 
-    const { programMemoryOverride, truncatedAst } = await this.setupSketch({
+    const { truncatedAst } = await this.setupSketch({
       sketchPathToNode,
       forward,
       up,
@@ -1634,7 +1612,7 @@ export class SceneEntities {
         if (sketchInit.type === 'PipeExpression') {
           const moddedResult = changeSketchArguments(
             modded,
-            kclManager.programMemory,
+            kclManager.variables,
             {
               type: 'path',
               pathToNode: [
@@ -1657,13 +1635,10 @@ export class SceneEntities {
         const { execState } = await executeAst({
           ast: modded,
           engineCommandManager: this.engineCommandManager,
-          // We make sure to send an empty program memory to denote we mean mock mode.
-          programMemoryOverride,
+          isMock: true,
         })
-        const programMemory = execState.memory
-        this.sceneProgramMemory = programMemory
         const sketch = sketchFromKclValue(
-          programMemory.get(variableDeclarationName),
+          execState.variables[variableDeclarationName],
           variableDeclarationName
         )
         if (err(sketch)) return
@@ -1700,7 +1675,7 @@ export class SceneEntities {
         if (sketchInit.type === 'PipeExpression') {
           const moddedResult = changeSketchArguments(
             modded,
-            kclManager.programMemory,
+            kclManager.variables,
             {
               type: 'path',
               pathToNode: [
@@ -1788,7 +1763,7 @@ export class SceneEntities {
           const sketch = sketchFromPathToNode({
             pathToNode,
             ast: kclManager.ast,
-            programMemory: kclManager.programMemory,
+            variables: kclManager.variables,
           })
           if (trap(sketch)) return
           if (!sketch) {
@@ -1801,7 +1776,7 @@ export class SceneEntities {
             const prevSegment = sketch.paths[pipeIndex - 2]
             const mod = addNewSketchLn({
               node: kclManager.ast,
-              programMemory: kclManager.programMemory,
+              variables: kclManager.variables,
               input: {
                 type: 'straight-segment',
                 to: [intersectionPoint.twoD.x, intersectionPoint.twoD.y],
@@ -1873,15 +1848,15 @@ export class SceneEntities {
       ...this.mouseEnterLeaveCallbacks(),
     })
   }
-  prepareTruncatedMemoryAndAst = (
+  prepareTruncatedAst = (
     sketchPathToNode: PathToNode,
     ast?: Node<Program>,
     draftSegment?: DraftSegment
   ) =>
-    prepareTruncatedMemoryAndAst(
+    prepareTruncatedAst(
       sketchPathToNode,
       ast || kclManager.ast,
-      kclManager.lastSuccessfulProgramMemory,
+      kclManager.lastSuccessfulVariables,
       draftSegment
     )
   onDragSegment({
@@ -1897,7 +1872,6 @@ export class SceneEntities {
     intersects: Intersection<Object3D<Object3DEventMap>>[]
     draftInfo?: {
       truncatedAst: Node<Program>
-      programMemoryOverride: ProgramMemory
       variableDeclarationName: string
     }
   }) {
@@ -2010,12 +1984,12 @@ export class SceneEntities {
           to: dragTo,
           from,
         },
-        previousProgramMemory: kclManager.programMemory,
+        variables: kclManager.variables,
       })
     } else {
       modded = changeSketchArguments(
         modifiedAst,
-        kclManager.programMemory,
+        kclManager.variables,
         {
           type: 'sourceRange',
           sourceRange: topLevelRange(node.start, node.end),
@@ -2028,10 +2002,9 @@ export class SceneEntities {
     modifiedAst = modded.modifiedAst
     const info = draftInfo
       ? draftInfo
-      : this.prepareTruncatedMemoryAndAst(pathToNode || [])
+      : this.prepareTruncatedAst(pathToNode || [])
     if (trap(info, { suppress: true })) return
-    const { truncatedAst, programMemoryOverride, variableDeclarationName } =
-      info
+    const { truncatedAst, variableDeclarationName } = info
     ;(async () => {
       const code = recast(modifiedAst)
       if (trap(code)) return
@@ -2042,13 +2015,11 @@ export class SceneEntities {
       const { execState } = await executeAst({
         ast: truncatedAst,
         engineCommandManager: this.engineCommandManager,
-        // We make sure to send an empty program memory to denote we mean mock mode.
-        programMemoryOverride,
+        isMock: true,
       })
-      const programMemory = execState.memory
-      this.sceneProgramMemory = programMemory
+      const variables = execState.variables
 
-      const maybeSketch = programMemory.get(variableDeclarationName)
+      const maybeSketch = variables[variableDeclarationName]
       let sketch: Sketch | undefined
       const sk = sketchFromKclValueOptional(
         maybeSketch,
@@ -2394,15 +2365,14 @@ export class SceneEntities {
 
 // calculations/pure-functions/easy to test so no excuse not to
 
-function prepareTruncatedMemoryAndAst(
+function prepareTruncatedAst(
   sketchPathToNode: PathToNode,
   ast: Node<Program>,
-  programMemory: ProgramMemory,
+  variables: VariableMap,
   draftSegment?: DraftSegment
 ):
   | {
       truncatedAst: Node<Program>
-      programMemoryOverride: ProgramMemory
       variableDeclarationName: string
     }
   | Error {
@@ -2417,7 +2387,7 @@ function prepareTruncatedMemoryAndAst(
   if (err(_node)) return _node
   const variableDeclarationName = _node.node?.declaration.id?.name || ''
   const sg = sketchFromKclValue(
-    programMemory.get(variableDeclarationName),
+    variables[variableDeclarationName],
     variableDeclarationName
   )
   if (err(sg)) return sg
@@ -2476,43 +2446,8 @@ function prepareTruncatedMemoryAndAst(
     body: [structuredClone(_ast.body[bodyIndex])],
   }
 
-  // Grab all the TagDeclarators and TagIdentifiers from memory.
-  let start = _node.node.start
-  const programMemoryOverride = programMemory.filterVariables(true, (value) => {
-    if (
-      !('__meta' in value) ||
-      value.__meta === undefined ||
-      value.__meta.length === 0 ||
-      value.__meta[0].sourceRange === undefined
-    ) {
-      return false
-    }
-
-    if (value.__meta[0].sourceRange[0] >= start) {
-      // We only want things before our start point.
-      return false
-    }
-
-    return value.type === 'TagIdentifier'
-  })
-  if (err(programMemoryOverride)) return programMemoryOverride
-
-  for (let i = 0; i < bodyIndex; i++) {
-    const node = _ast.body[i]
-    if (node.type !== 'VariableDeclaration') {
-      continue
-    }
-    const name = node.declaration.id.name
-    const memoryItem = programMemory.get(name)
-    if (!memoryItem) {
-      continue
-    }
-    const error = programMemoryOverride.set(name, structuredClone(memoryItem))
-    if (err(error)) return error
-  }
   return {
     truncatedAst,
-    programMemoryOverride,
     variableDeclarationName,
   }
 }
@@ -2532,11 +2467,11 @@ export function getParentGroup(
 export function sketchFromPathToNode({
   pathToNode,
   ast,
-  programMemory,
+  variables,
 }: {
   pathToNode: PathToNode
   ast: Program
-  programMemory: ProgramMemory
+  variables: VariableMap
 }): Sketch | null | Error {
   const _varDec = getNodeFromPath<VariableDeclarator>(
     kclManager.ast,
@@ -2545,7 +2480,7 @@ export function sketchFromPathToNode({
   )
   if (err(_varDec)) return _varDec
   const varDec = _varDec.node
-  const result = programMemory.get(varDec?.id?.name || '')
+  const result = variables[varDec?.id?.name || '']
   if (result?.type === 'Solid') {
     return result.value.sketch
   }
@@ -2584,7 +2519,7 @@ export function getSketchQuaternion(
   const sketch = sketchFromPathToNode({
     pathToNode: sketchPathToNode,
     ast: kclManager.ast,
-    programMemory: kclManager.programMemory,
+    variables: kclManager.variables,
   })
   if (err(sketch)) return sketch
   const zAxis = sketch?.on.zAxis || sketchNormalBackUp
@@ -2601,7 +2536,7 @@ export async function getSketchOrientationDetails(
   const sketch = sketchFromPathToNode({
     pathToNode: sketchPathToNode,
     ast: kclManager.ast,
-    programMemory: kclManager.programMemory,
+    variables: kclManager.variables,
   })
   if (err(sketch)) return Promise.reject(sketch)
   if (!sketch) return Promise.reject('sketch not found')

src/components/AvailableVarsHelpers.tsx

@@ -1,11 +1,5 @@
 import { useEffect, useState, useRef } from 'react'
-import {
-  parse,
-  BinaryPart,
-  Expr,
-  ProgramMemory,
-  resultIsOk,
-} from '../lang/wasm'
+import { parse, BinaryPart, Expr, resultIsOk, VariableMap } from '../lang/wasm'
 import {
   createIdentifier,
   createLiteral,
@@ -100,7 +94,7 @@ export function useCalc({
   newVariableInsertIndex: number
   setNewVariableName: (a: string) => void
 } {
-  const { programMemory } = useKclContext()
+  const { variables } = useKclContext()
   const { context } = useModelingContext()
   const selectionRange =
     context.selectionRanges?.graphSelections[0]?.codeRef?.range
@@ -127,7 +121,7 @@ export function useCalc({
   }, [])
 
   useEffect(() => {
-    if (programMemory.has(newVariableName)) {
+    if (variables[newVariableName]) {
       setIsNewVariableNameUnique(false)
     } else {
       setIsNewVariableNameUnique(true)
@@ -135,14 +129,14 @@ export function useCalc({
   }, [newVariableName])
 
   useEffect(() => {
-    if (!programMemory || !selectionRange) return
+    if (!variables || !selectionRange) return
     const varInfo = findAllPreviousVariables(
       kclManager.ast,
-      kclManager.programMemory,
+      kclManager.variables,
       selectionRange
     )
     setAvailableVarInfo(varInfo)
-  }, [kclManager.ast, kclManager.programMemory, selectionRange])
+  }, [kclManager.ast, kclManager.variables, selectionRange])
 
   useEffect(() => {
     try {
@@ -150,9 +144,9 @@ export function useCalc({
       const pResult = parse(code)
       if (trap(pResult) || !resultIsOk(pResult)) return
       const ast = pResult.program
-      const _programMem: ProgramMemory = ProgramMemory.empty()
+      const _variables: VariableMap = {}
       for (const { key, value } of availableVarInfo.variables) {
-        const error = _programMem.set(key, {
+        const error = (_variables[key] = {
           type: 'String',
           value,
           __meta: [],
@@ -163,8 +157,8 @@ export function useCalc({
       executeAst({
         ast,
         engineCommandManager,
-        // We make sure to send an empty program memory to denote we mean mock mode.
-        programMemoryOverride: kclManager.programMemory.clone(),
+        isMock: true,
+        variables,
       }).then(({ execState }) => {
         const resultDeclaration = ast.body.find(
           (a) =>
@@ -174,7 +168,7 @@ export function useCalc({
         const init =
           resultDeclaration?.type === 'VariableDeclaration' &&
           resultDeclaration?.declaration.init
-        const result = execState.memory?.get('__result__')?.value
+        const result = execState.variables['__result__']?.value
         setCalcResult(typeof result === 'number' ? String(result) : 'NAN')
         init && setValueNode(init)
       })

src/components/LspProvider.tsx

@@ -157,8 +157,6 @@ export const LspProvider = ({ children }: { children: React.ReactNode }) => {
                 // eslint-disable-next-line @typescript-eslint/no-floating-promises
                 plugin.requestSemanticTokens()
                 break
-              case 'kcl/memoryUpdated':
-                break
             }
           } catch (error) {
             console.error(error)

src/components/ModelingSidebar/ModelingPanes/MemoryPane.test.tsx

@@ -1,6 +1,6 @@
 import { processMemory } from './MemoryPane'
 import { enginelessExecutor } from '../../../lib/testHelpers'
-import { assertParse, initPromise, ProgramMemory } from '../../../lang/wasm'
+import { assertParse, initPromise } from '../../../lang/wasm'
 
 beforeAll(async () => {
   await initPromise
@@ -29,15 +29,11 @@ describe('processMemory', () => {
     |> line(endAbsolute = [2.15, 4.32])
     // |> rx(90, %)`
     const ast = assertParse(code)
-    const execState = await enginelessExecutor(ast, ProgramMemory.empty())
-    const output = processMemory(execState.memory)
+    const execState = await enginelessExecutor(ast)
+    const output = processMemory(execState.variables)
     expect(output.myVar).toEqual(5)
     expect(output.otherVar).toEqual(3)
     expect(output).toEqual({
-      HALF_TURN: 180,
-      QUARTER_TURN: 90,
-      THREE_QUARTER_TURN: 270,
-      ZERO: 0,
       myVar: 5,
       myFn: '__function(a)__',
       otherVar: 3,

src/components/ModelingSidebar/ModelingPanes/MemoryPane.tsx

@@ -2,10 +2,10 @@ import toast from 'react-hot-toast'
 import ReactJson from 'react-json-view'
 import { useMemo } from 'react'
 import {
-  ProgramMemory,
   Path,
   ExtrudeSurface,
   sketchFromKclValueOptional,
+  VariableMap,
 } from 'lang/wasm'
 import { useKclContext } from 'lang/KclProvider'
 import { useResolvedTheme } from 'hooks/useResolvedTheme'
@@ -15,12 +15,12 @@ import Tooltip from 'components/Tooltip'
 import { useModelingContext } from 'hooks/useModelingContext'
 
 export const MemoryPaneMenu = () => {
-  const { programMemory } = useKclContext()
+  const { variables } = useKclContext()
 
   function copyProgramMemoryToClipboard() {
     if (globalThis && 'navigator' in globalThis) {
       navigator.clipboard
-        .writeText(JSON.stringify(programMemory))
+        .writeText(JSON.stringify(variables))
         .then(() => toast.success('Program memory copied to clipboard'))
         .catch((e) =>
           trap(new Error('Failed to copy program memory to clipboard'))
@@ -50,12 +50,9 @@ export const MemoryPaneMenu = () => {
 
 export const MemoryPane = () => {
   const theme = useResolvedTheme()
-  const { programMemory } = useKclContext()
+  const { variables } = useKclContext()
   const { state } = useModelingContext()
-  const ProcessedMemory = useMemo(
-    () => processMemory(programMemory),
-    [programMemory]
-  )
+  const ProcessedMemory = useMemo(() => processMemory(variables), [variables])
   return (
     <div className="h-full relative">
       <div className="absolute inset-0 p-2 flex flex-col items-start">
@@ -85,9 +82,10 @@ export const MemoryPane = () => {
   )
 }
 
-export const processMemory = (programMemory: ProgramMemory) => {
+export const processMemory = (variables: VariableMap) => {
   const processedMemory: any = {}
-  for (const [key, val] of programMemory?.visibleEntries()) {
+  for (const [key, val] of Object.entries(variables)) {
+    if (val === undefined) continue
     if (
       val.type === 'Sketch' ||
       // @ts-ignore

src/components/ProjectSidebarMenu.tsx

@@ -19,7 +19,6 @@ import { commandBarActor } from 'machines/commandBarMachine'
 import { useSelector } from '@xstate/react'
 import { copyFileShareLink } from 'lib/links'
 import { useSettingsAuthContext } from 'hooks/useSettingsAuthContext'
-import { IS_NIGHTLY_OR_DEBUG } from 'routes/Settings'
 import { useToken } from 'machines/appMachine'
 
 const ProjectSidebarMenu = ({
@@ -194,7 +193,7 @@ function ProjectMenuPopover({
           id: 'share-link',
           Element: 'button',
           children: 'Share current part (via Zoo link)',
-          disabled: !(IS_NIGHTLY_OR_DEBUG && findCommand(shareCommandInfo)),
+          disabled: !findCommand(shareCommandInfo),
           onClick: async () => {
             await copyFileShareLink({
               token: token ?? '',

src/components/Toolbar/EqualAngle.tsx

@@ -95,7 +95,7 @@ export function applyConstraintEqualAngle({
     ast: kclManager.ast,
     selectionRanges,
     transformInfos: transforms,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
   })
   if (err(transform)) return transform
   const { modifiedAst, pathToNodeMap } = transform

src/components/Toolbar/EqualLength.tsx

@@ -93,7 +93,7 @@ export function applyConstraintEqualLength({
     ast: kclManager.ast,
     selectionRanges,
     transformInfos: transforms,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
   })
   if (err(transform)) return transform
   const { modifiedAst, pathToNodeMap } = transform

src/components/Toolbar/HorzVert.tsx

@@ -1,6 +1,6 @@
 import { toolTips } from 'lang/langHelpers'
 import { Selections } from 'lib/selections'
-import { Program, ProgramMemory, Expr } from '../../lang/wasm'
+import { Program, Expr, VariableMap } from '../../lang/wasm'
 import { getNodeFromPath } from '../../lang/queryAst'
 import {
   PathToNodeMap,
@@ -51,7 +51,7 @@ export function applyConstraintHorzVert(
   selectionRanges: Selections,
   horOrVert: 'vertical' | 'horizontal',
   ast: Node<Program>,
-  programMemory: ProgramMemory
+  memVars: VariableMap
 ):
   | {
       modifiedAst: Node<Program>
@@ -66,7 +66,7 @@ export function applyConstraintHorzVert(
     ast,
     selectionRanges,
     transformInfos,
-    programMemory,
+    memVars,
     referenceSegName: '',
   })
 }

src/components/Toolbar/Intersect.tsx

@@ -46,7 +46,7 @@ export function intersectInfo({
     isLinesParallelAndConstrained(
       kclManager.ast,
       engineCommandManager.artifactGraph,
-      kclManager.programMemory,
+      kclManager.variables,
       selectionRanges.graphSelections[0],
       selectionRanges.graphSelections[1]
     )
@@ -147,7 +147,7 @@ export async function applyConstraintIntersect({
     ast: structuredClone(kclManager.ast),
     selectionRanges: forcedSelectionRanges,
     transformInfos: transforms,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
   })
   if (err(transform1)) return Promise.reject(transform1)
   const { modifiedAst, tagInfo, valueUsedInTransform, pathToNodeMap } =
@@ -184,7 +184,7 @@ export async function applyConstraintIntersect({
     ast: kclManager.ast,
     selectionRanges: forcedSelectionRanges,
     transformInfos: transforms,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
     forceSegName: segName,
     forceValueUsedInTransform: finalValue,
   })

src/components/Toolbar/RemoveConstrainingValues.tsx

@@ -88,7 +88,7 @@ export function applyRemoveConstrainingValues({
     ast: kclManager.ast,
     selectionRanges: updatedSelectionRanges,
     transformInfos: transforms,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
     referenceSegName: '',
   })
 }

src/components/Toolbar/SetAbsDistance.tsx

@@ -104,7 +104,7 @@ export async function applyConstraintAbsDistance({
     ast: structuredClone(kclManager.ast),
     selectionRanges,
     transformInfos,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
     referenceSegName: '',
   })
   if (err(transform1)) return Promise.reject(transform1)
@@ -124,7 +124,7 @@ export async function applyConstraintAbsDistance({
     ast: structuredClone(kclManager.ast),
     selectionRanges,
     transformInfos,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
     referenceSegName: '',
     forceValueUsedInTransform: finalValue,
   })
@@ -172,7 +172,7 @@ export function applyConstraintAxisAlign({
     ast: structuredClone(kclManager.ast),
     selectionRanges,
     transformInfos,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
     referenceSegName: '',
     forceValueUsedInTransform: finalValue,
   })

src/components/Toolbar/SetAngleBetween.tsx

@@ -95,7 +95,7 @@ export async function applyConstraintAngleBetween({
     ast: structuredClone(kclManager.ast),
     selectionRanges,
     transformInfos,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
   })
   if (err(transformed1)) return Promise.reject(transformed1)
   const { modifiedAst, tagInfo, valueUsedInTransform, pathToNodeMap } =
@@ -133,7 +133,7 @@ export async function applyConstraintAngleBetween({
     ast: kclManager.ast,
     selectionRanges,
     transformInfos,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
     forceSegName: segName,
     forceValueUsedInTransform: finalValue,
   })

src/components/Toolbar/SetHorzVertDistance.tsx

@@ -107,7 +107,7 @@ export async function applyConstraintHorzVertDistance({
     ast: structuredClone(kclManager.ast),
     selectionRanges,
     transformInfos,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
   })
   if (err(transformed)) return Promise.reject(transformed)
   const { modifiedAst, tagInfo, valueUsedInTransform, pathToNodeMap } =
@@ -145,7 +145,7 @@ export async function applyConstraintHorzVertDistance({
       ast: kclManager.ast,
       selectionRanges,
       transformInfos,
-      programMemory: kclManager.programMemory,
+      memVars: kclManager.variables,
       forceSegName: segName,
       forceValueUsedInTransform: finalValue,
     })
@@ -195,7 +195,7 @@ export function applyConstraintHorzVertAlign({
     ast: kclManager.ast,
     selectionRanges,
     transformInfos,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
     forceValueUsedInTransform: finalValue,
   })
   if (err(retval)) return retval

src/components/Toolbar/setAngleLength.tsx

@@ -105,7 +105,7 @@ export async function applyConstraintLength({
     ast,
     selectionRanges,
     transformInfos: transforms,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
     referenceSegName: '',
     forceValueUsedInTransform: distanceExpression,
   })
@@ -137,7 +137,7 @@ export async function applyConstraintAngleLength({
     ast: structuredClone(kclManager.ast),
     selectionRanges,
     transformInfos: transforms,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
     referenceSegName: '',
   })
   if (err(sketched)) return Promise.reject(sketched)
@@ -189,7 +189,7 @@ export async function applyConstraintAngleLength({
     ast: structuredClone(kclManager.ast),
     selectionRanges,
     transformInfos: transforms,
-    programMemory: kclManager.programMemory,
+    memVars: kclManager.variables,
     referenceSegName: '',
     forceValueUsedInTransform: finalValue,
   })

src/hooks/useToolbarGuards.ts

@@ -55,7 +55,7 @@ export function useConvertToVariable(range?: SourceRange) {
       const { modifiedAst: _modifiedAst, pathToReplacedNode } =
         moveValueIntoNewVariable(
           ast,
-          kclManager.programMemory,
+          kclManager.variables,
           range || context.selectionRanges.graphSelections[0]?.codeRef?.range,
           variableName
         )

src/lang/KclProvider.tsx

@@ -7,7 +7,7 @@ import { KCLError } from './errors'
 
 const KclContext = createContext({
   code: codeManager?.code || '',
-  programMemory: kclManager?.programMemory,
+  variables: kclManager?.variables,
   ast: kclManager?.ast,
   isExecuting: kclManager?.isExecuting,
   diagnostics: kclManager?.diagnostics,
@@ -31,7 +31,7 @@ export function KclContextProvider({
   // Both the code state and the editor state start off with the same code.
   const [code, setCode] = useState(loadedCode || codeManager.code)
 
-  const [programMemory, setProgramMemory] = useState(kclManager.programMemory)
+  const [variables, setVariables] = useState(kclManager.variables)
   const [ast, setAst] = useState(kclManager.ast)
   const [isExecuting, setIsExecuting] = useState(false)
   const [diagnostics, setDiagnostics] = useState<Diagnostic[]>([])
@@ -44,7 +44,7 @@ export function KclContextProvider({
       setCode,
     })
     kclManager.registerCallBacks({
-      setProgramMemory,
+      setVariables,
       setAst,
       setLogs,
       setErrors,
@@ -58,7 +58,7 @@ export function KclContextProvider({
     <KclContext.Provider
       value={{
         code,
-        programMemory,
+        variables,
         ast,
         isExecuting,
         diagnostics,

src/lang/KclSingleton.ts

@@ -17,13 +17,14 @@ import {
   emptyExecState,
   ExecState,
   initPromise,
+  KclValue,
   parse,
   PathToNode,
   Program,
-  ProgramMemory,
   recast,
   SourceRange,
   topLevelRange,
+  VariableMap,
 } from 'lang/wasm'
 import { getNodeFromPath, getSettingsAnnotation } from './queryAst'
 import { codeManager, editorManager, sceneInfra } from 'lib/singletons'
@@ -61,8 +62,8 @@ export class KclManager {
     trivia: [],
   }
   private _execState: ExecState = emptyExecState()
-  private _programMemory: ProgramMemory = ProgramMemory.empty()
-  lastSuccessfulProgramMemory: ProgramMemory = ProgramMemory.empty()
+  private _variables: VariableMap = {}
+  lastSuccessfulVariables: VariableMap = {}
   lastSuccessfulOperations: Operation[] = []
   private _logs: string[] = []
   private _errors: KCLError[] = []
@@ -78,7 +79,9 @@ export class KclManager {
 
   private _isExecutingCallback: (arg: boolean) => void = () => {}
   private _astCallBack: (arg: Node<Program>) => void = () => {}
-  private _programMemoryCallBack: (arg: ProgramMemory) => void = () => {}
+  private _variablesCallBack: (arg: {
+    [key in string]?: KclValue | undefined
+  }) => void = () => {}
   private _logsCallBack: (arg: string[]) => void = () => {}
   private _kclErrorsCallBack: (errors: KCLError[]) => void = () => {}
   private _diagnosticsCallback: (errors: Diagnostic[]) => void = () => {}
@@ -97,18 +100,18 @@ export class KclManager {
     this._switchedFiles = switchedFiles
   }
 
-  get programMemory() {
-    return this._programMemory
+  get variables() {
+    return this._variables
   }
   // This is private because callers should be setting the entire execState.
-  private set programMemory(programMemory) {
-    this._programMemory = programMemory
-    this._programMemoryCallBack(programMemory)
+  private set variables(variables) {
+    this._variables = variables
+    this._variablesCallBack(variables)
   }
 
   private set execState(execState) {
     this._execState = execState
-    this.programMemory = execState.memory
+    this.variables = execState.variables
   }
 
   get execState() {
@@ -201,7 +204,7 @@ export class KclManager {
   }
 
   registerCallBacks({
-    setProgramMemory,
+    setVariables,
     setAst,
     setLogs,
     setErrors,
@@ -209,7 +212,7 @@ export class KclManager {
     setIsExecuting,
     setWasmInitFailed,
   }: {
-    setProgramMemory: (arg: ProgramMemory) => void
+    setVariables: (arg: VariableMap) => void
     setAst: (arg: Node<Program>) => void
     setLogs: (arg: string[]) => void
     setErrors: (errors: KCLError[]) => void
@@ -217,7 +220,7 @@ export class KclManager {
     setIsExecuting: (arg: boolean) => void
     setWasmInitFailed: (arg: boolean) => void
   }) {
-    this._programMemoryCallBack = setProgramMemory
+    this._variablesCallBack = setVariables
     this._astCallBack = setAst
     this._logsCallBack = setLogs
     this._kclErrorsCallBack = setErrors
@@ -329,6 +332,7 @@ export class KclManager {
       ast,
       path: codeManager.currentFilePath || undefined,
       engineCommandManager: this.engineCommandManager,
+      isMock: false,
     })
 
     // Program was not interrupted, setup the scene
@@ -385,11 +389,11 @@ export class KclManager {
     this.addDiagnostics(isInterrupted ? [] : kclErrorsToDiagnostics(errors))
     this.execState = execState
     if (!errors.length) {
-      this.lastSuccessfulProgramMemory = execState.memory
+      this.lastSuccessfulVariables = execState.variables
       this.lastSuccessfulOperations = execState.operations
     }
     this.ast = { ...ast }
-    // updateArtifactGraph relies on updated executeState/programMemory
+    // updateArtifactGraph relies on updated executeState/variables
     this.engineCommandManager.updateArtifactGraph(execState.artifactGraph)
     this._executeCallback()
     if (!isInterrupted) {
@@ -442,16 +446,15 @@ export class KclManager {
     const { logs, errors, execState } = await executeAst({
       ast: newAst,
       engineCommandManager: this.engineCommandManager,
-      // We make sure to send an empty program memory to denote we mean mock mode.
-      programMemoryOverride: ProgramMemory.empty(),
+      isMock: true,
     })
 
     this._logs = logs
     this.addDiagnostics(kclErrorsToDiagnostics(errors))
     this._execState = execState
-    this._programMemory = execState.memory
+    this._variables = execState.variables
     if (!errors.length) {
-      this.lastSuccessfulProgramMemory = execState.memory
+      this.lastSuccessfulVariables = execState.variables
       this.lastSuccessfulOperations = execState.operations
     }
   }

src/lang/abstractSyntaxTree.test.ts

@@ -1,59 +0,0 @@
-import { assertParse, initPromise, parse } from './wasm'
-import { err } from 'lib/trap'
-
-beforeAll(async () => {
-  await initPromise
-})
-
-describe('testing AST', () => {
-  test('5 + 6', () => {
-    const ast = assertParse('5 +6')
-    delete (ast as any).nonCodeMeta
-    expect(ast.body).toEqual([
-      {
-        type: 'ExpressionStatement',
-        start: 0,
-        end: 4,
-
-        expression: {
-          type: 'BinaryExpression',
-          start: 0,
-          end: 4,
-
-          left: {
-            type: 'Literal',
-            start: 0,
-            end: 1,
-            value: {
-              suffix: 'None',
-              value: 5,
-            },
-            raw: '5',
-          },
-          operator: '+',
-          right: {
-            type: 'Literal',
-            start: 3,
-            end: 4,
-            value: {
-              suffix: 'None',
-              value: 6,
-            },
-            raw: '6',
-          },
-        },
-      },
-    ])
-  })
-})
-
-describe('parsing errors', () => {
-  it('should return an error when there is a unexpected closed curly brace', async () => {
-    const code = `const myVar = startSketchAt([}], %)`
-    const result = parse(code)
-    if (err(result)) throw result
-    const error = result.errors[0]
-    expect(error.message).toBe('Array is missing a closing bracket(`]`)')
-    expect(error.sourceRange).toEqual([28, 29, 0])
-  })
-})

src/lang/artifact.test.ts

@@ -15,8 +15,7 @@ const mySketch001 = startSketchOn('XY')
   |> line(endAbsolute = [0.46, -5.82])
   // |> rx(45, %)`
     const execState = await enginelessExecutor(assertParse(code))
-    // @ts-ignore
-    const sketch001 = execState.memory.get('mySketch001')
+    const sketch001 = execState.variables['mySketch001']
     expect(sketch001).toEqual({
       type: 'Sketch',
       value: {
@@ -73,8 +72,7 @@ const mySketch001 = startSketchOn('XY')
   // |> rx(45, %)
   |> extrude(length = 2)`
     const execState = await enginelessExecutor(assertParse(code))
-    // @ts-ignore
-    const sketch001 = execState.memory.get('mySketch001')
+    const sketch001 = execState.variables['mySketch001']
     expect(sketch001).toEqual({
       type: 'Solid',
       value: {
@@ -165,9 +163,9 @@ const sk2 = startSketchOn('XY')
 
 `
     const execState = await enginelessExecutor(assertParse(code))
-    const programMemory = execState.memory
+    const variables = execState.variables
     // @ts-ignore
-    const geos = [programMemory.get('theExtrude'), programMemory.get('sk2')]
+    const geos = [variables['theExtrude'], variables['sk2']]
     expect(geos).toEqual([
       {
         type: 'Solid',

src/lang/executor.test.ts

@@ -2,12 +2,12 @@ import fs from 'node:fs'
 
 import {
   assertParse,
-  ProgramMemory,
   Sketch,
   initPromise,
   sketchFromKclValue,
   defaultArtifactGraph,
   topLevelRange,
+  VariableMap,
 } from './wasm'
 import { enginelessExecutor } from '../lib/testHelpers'
 import { KCLError } from './errors'
@@ -21,13 +21,13 @@ describe('test executor', () => {
     const code = `const myVar = 5
 const newVar = myVar + 1`
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(5)
-    expect(mem.get('newVar')?.value).toBe(6)
+    expect(mem['myVar']?.value).toBe(5)
+    expect(mem['newVar']?.value).toBe(6)
   })
   it('test assigning a var with a string', async () => {
     const code = `const myVar = "a str"`
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe('a str')
+    expect(mem['myVar']?.value).toBe('a str')
   })
   it('test assigning a var by cont concatenating two strings string execute', async () => {
     const code = fs.readFileSync(
@@ -35,7 +35,7 @@ const newVar = myVar + 1`
       'utf-8'
     )
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe('a str another str')
+    expect(mem['myVar']?.value).toBe('a str another str')
   })
   it('fn funcN = () => {} execute', async () => {
     const mem = await exe(
@@ -47,8 +47,8 @@ const newVar = myVar + 1`
         'const magicNum = funcN(9, theVar)',
       ].join('\n')
     )
-    expect(mem.get('theVar')?.value).toBe(60)
-    expect(mem.get('magicNum')?.value).toBe(69)
+    expect(mem['theVar']?.value).toBe(60)
+    expect(mem['magicNum']?.value).toBe(69)
   })
   it('sketch declaration', async () => {
     let code = `const mySketch = startSketchOn('XY')
@@ -60,7 +60,7 @@ const newVar = myVar + 1`
 `
     const mem = await exe(code)
     // geo is three js buffer geometry and is very bloated to have in tests
-    const sk = mem.get('mySketch')
+    const sk = mem['mySketch']
     expect(sk?.type).toEqual('Sketch')
     if (sk?.type !== 'Sketch') {
       return
@@ -117,7 +117,7 @@ const newVar = myVar + 1`
       'const myVar = 5 + 1 |> myFn(%)',
     ].join('\n')
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(7)
+    expect(mem['myVar']?.value).toBe(7)
   })
 
   // Enable rotations #152
@@ -130,15 +130,15 @@ const newVar = myVar + 1`
   //     'const rotated = rx(90, mySk1)',
   //   ].join('\n')
   //   const mem = await exe(code)
-  //   expect(mem.get('mySk1')?.value).toHaveLength(3)
-  //   expect(mem.get('rotated')?.type).toBe('Sketch')
+  //   expect(mem['mySk1']?.value).toHaveLength(3)
+  //   expect(mem['rotated')?.type).toBe('Sketch']
   //   if (
-  //     mem.get('mySk1')?.type !== 'Sketch' ||
-  //     mem.get('rotated')?.type !== 'Sketch'
+  //     mem['mySk1']?.type !== 'Sketch' ||
+  //     mem['rotated']?.type !== 'Sketch'
   //   )
   //     throw new Error('not a sketch')
-  //   expect(mem.get('mySk1')?.rotation).toEqual([0, 0, 0, 1])
-  //   expect(mem.get('rotated')?.rotation.map((a) => a.toFixed(4))).toEqual([
+  //   expect(mem['mySk1']?.rotation).toEqual([0, 0, 0, 1])
+  //   expect(mem['rotated']?.rotation.map((a) => a.toFixed(4))).toEqual([
   //     '0.7071',
   //     '0.0000',
   //     '0.0000',
@@ -157,7 +157,7 @@ const newVar = myVar + 1`
       // '  |> rx(90, %)',
     ].join('\n')
     const mem = await exe(code)
-    expect(mem.get('mySk1')).toEqual({
+    expect(mem['mySk1']).toEqual({
       type: 'Sketch',
       value: {
         type: 'Sketch',
@@ -236,7 +236,7 @@ const newVar = myVar + 1`
     )
     const mem = await exe(code)
     // TODO path to node is probably wrong here, zero indexes are not correct
-    expect(mem.get('three')).toEqual({
+    expect(mem['three']).toEqual({
       type: 'Number',
       value: 3,
       __meta: [
@@ -245,7 +245,7 @@ const newVar = myVar + 1`
         },
       ],
     })
-    expect(mem.get('yo')).toEqual({
+    expect(mem['yo']).toEqual({
       type: 'Array',
       value: [
         { type: 'Number', value: 1, __meta: [{ sourceRange: [28, 29, 0] }] },
@@ -263,9 +263,6 @@ const newVar = myVar + 1`
         },
       ],
     })
-    // Check that there are no other variables or environments.
-    expect(mem.numEnvironments()).toBe(1)
-    expect(mem.numVariables(0)).toBe(2)
   })
   it('execute object expression', async () => {
     const code = [
@@ -273,7 +270,7 @@ const newVar = myVar + 1`
       "const yo = {aStr: 'str', anum: 2, identifier: three, binExp: 4 + 5}",
     ].join('\n')
     const mem = await exe(code)
-    expect(mem.get('yo')).toEqual({
+    expect(mem['yo']).toEqual({
       type: 'Object',
       value: {
         aStr: {
@@ -309,7 +306,7 @@ const newVar = myVar + 1`
       '\n'
     )
     const mem = await exe(code)
-    expect(mem.get('myVar')).toEqual({
+    expect(mem['myVar']).toEqual({
       type: 'String',
       value: '123',
       __meta: [
@@ -325,80 +322,80 @@ describe('testing math operators', () => {
   it('can sum', async () => {
     const code = ['const myVar = 1 + 2'].join('\n')
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(3)
+    expect(mem['myVar']?.value).toBe(3)
   })
   it('can subtract', async () => {
     const code = ['const myVar = 1 - 2'].join('\n')
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(-1)
+    expect(mem['myVar']?.value).toBe(-1)
   })
   it('can multiply', async () => {
     const code = ['const myVar = 1 * 2'].join('\n')
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(2)
+    expect(mem['myVar']?.value).toBe(2)
   })
   it('can divide', async () => {
     const code = ['const myVar = 1 / 2'].join('\n')
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(0.5)
+    expect(mem['myVar']?.value).toBe(0.5)
   })
   it('can modulus', async () => {
     const code = ['const myVar = 5 % 2'].join('\n')
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(1)
+    expect(mem['myVar']?.value).toBe(1)
   })
   it('can do multiple operations', async () => {
     const code = ['const myVar = 1 + 2 * 3'].join('\n')
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(7)
+    expect(mem['myVar']?.value).toBe(7)
   })
   it('big example with parans', async () => {
     const code = ['const myVar = 1 + 2 * (3 - 4) / -5 + 6'].join('\n')
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(7.4)
+    expect(mem['myVar']?.value).toBe(7.4)
   })
   it('with identifier', async () => {
     const code = ['const yo = 6', 'const myVar = yo / 2'].join('\n')
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(3)
+    expect(mem['myVar']?.value).toBe(3)
   })
   it('with lots of testing', async () => {
     const code = ['const myVar = 2 * ((2 + 3 ) / 4 + 5)'].join('\n')
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(12.5)
+    expect(mem['myVar']?.value).toBe(12.5)
   })
   it('with callExpression at start', async () => {
     const code = 'const myVar = min(4, 100) + 2'
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(6)
+    expect(mem['myVar']?.value).toBe(6)
   })
   it('with callExpression at end', async () => {
     const code = 'const myVar = 2 + min(4, 100)'
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(6)
+    expect(mem['myVar']?.value).toBe(6)
   })
   it('with nested callExpression', async () => {
     const code = 'const myVar = 2 + min(100, legLen(5, 3))'
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(6)
+    expect(mem['myVar']?.value).toBe(6)
   })
   it('with unaryExpression', async () => {
     const code = 'const myVar = -min(100, 3)'
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(-3)
+    expect(mem['myVar']?.value).toBe(-3)
   })
   it('with unaryExpression in callExpression', async () => {
     const code = 'const myVar = min(-legLen(5, 4), 5)'
     const code2 = 'const myVar = min(5 , -legLen(5, 4))'
     const mem = await exe(code)
     const mem2 = await exe(code2)
-    expect(mem.get('myVar')?.value).toBe(-3)
-    expect(mem.get('myVar')?.value).toBe(mem2.get('myVar')?.value)
+    expect(mem['myVar']?.value).toBe(-3)
+    expect(mem['myVar']?.value).toBe(mem2['myVar']?.value)
   })
   it('with unaryExpression in ArrayExpression', async () => {
     const code = 'const myVar = [1,-legLen(5, 4)]'
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toEqual([
+    expect(mem['myVar']?.value).toEqual([
       {
         __meta: [
           {
@@ -426,7 +423,7 @@ describe('testing math operators', () => {
       '|> line(end = [-2.21, -legLen(5, min(3, 999))])',
     ].join('\n')
     const mem = await exe(code)
-    const sketch = sketchFromKclValue(mem.get('part001'), 'part001')
+    const sketch = sketchFromKclValue(mem['part001'], 'part001')
     // result of `-legLen(5, min(3, 999))` should be -4
     const yVal = (sketch as Sketch).paths?.[0]?.to?.[1]
     expect(yVal).toBe(-4)
@@ -444,7 +441,7 @@ describe('testing math operators', () => {
       ``,
     ].join('\n')
     const mem = await exe(code)
-    const sketch = sketchFromKclValue(mem.get('part001'), 'part001')
+    const sketch = sketchFromKclValue(mem['part001'], 'part001')
     // expect -legLen(segLen('seg01'), myVar) to equal -4 setting the y value back to 0
     expect((sketch as Sketch).paths?.[1]?.from).toEqual([3, 4])
     expect((sketch as Sketch).paths?.[1]?.to).toEqual([6, 0])
@@ -454,7 +451,7 @@ describe('testing math operators', () => {
     )
     const removedUnaryExpMem = await exe(removedUnaryExp)
     const removedUnaryExpMemSketch = sketchFromKclValue(
-      removedUnaryExpMem.get('part001'),
+      removedUnaryExpMem['part001'],
       'part001'
     )
 
@@ -464,12 +461,12 @@ describe('testing math operators', () => {
   it('with nested callExpression and binaryExpression', async () => {
     const code = 'const myVar = 2 + min(100, -1 + legLen(5, 3))'
     const mem = await exe(code)
-    expect(mem.get('myVar')?.value).toBe(5)
+    expect(mem['myVar']?.value).toBe(5)
   })
   it('can do power of math', async () => {
     const code = 'const myNeg2 = 4 ^ 2 - 3 ^ 2 * 2'
     const mem = await exe(code)
-    expect(mem.get('myNeg2')?.value).toBe(-2)
+    expect(mem['myNeg2']?.value).toBe(-2)
   })
 })
 
@@ -498,12 +495,9 @@ const theExtrude = startSketchOn('XY')
 
 // helpers
 
-async function exe(
-  code: string,
-  programMemory: ProgramMemory = ProgramMemory.empty()
-) {
+async function exe(code: string, variables: VariableMap = {}) {
   const ast = assertParse(code)
 
-  const execState = await enginelessExecutor(ast, programMemory)
-  return execState.memory
+  const execState = await enginelessExecutor(ast, true, undefined, variables)
+  return execState.variables
 }

src/lang/kclSamples.test.ts

@@ -1,4 +1,4 @@
-import { assertParse, initPromise, programMemoryInit } from './wasm'
+import { assertParse, initPromise } from './wasm'
 import { enginelessExecutor } from '../lib/testHelpers'
 
 import path from 'node:path'
@@ -32,7 +32,7 @@ child_process.spawnSync('git', [
   'clone',
   '--single-branch',
   '--branch',
-  'achalmers/kw-appearance',
+  'achalmers/kw-pattern',
   URL_GIT_KCL_SAMPLES,
   DIR_KCL_SAMPLES,
 ])
@@ -72,7 +72,7 @@ describe('Test KCL Samples from public Github repository', () => {
           const ast = assertParse(code)
           await enginelessExecutor(
             ast,
-            programMemoryInit(),
+            false,
             file.pathFromProjectDirectoryToFirstFile
           )
         },

src/lang/langHelpers.ts

@@ -1,12 +1,12 @@
 import {
   Program,
-  executor,
-  ProgramMemory,
+  executeWithEngine,
+  executeMock,
   kclLint,
   emptyExecState,
   ExecState,
+  VariableMap,
 } from 'lang/wasm'
-import { enginelessExecutor } from 'lib/testHelpers'
 import { EngineCommandManager } from 'lang/std/engineConnection'
 import { KCLError } from 'lang/errors'
 import { Diagnostic } from '@codemirror/lint'
@@ -48,14 +48,16 @@ export async function executeAst({
   ast,
   path,
   engineCommandManager,
-  // If you set programMemoryOverride we assume you mean mock mode. Since that
-  // is the only way to go about it.
-  programMemoryOverride,
+  isMock,
+  usePrevMemory,
+  variables,
 }: {
   ast: Node<Program>
   path?: string
   engineCommandManager: EngineCommandManager
-  programMemoryOverride?: ProgramMemory
+  isMock: boolean
+  usePrevMemory?: boolean
+  variables?: VariableMap
   isInterrupted?: boolean
 }): Promise<{
   logs: string[]
@@ -64,9 +66,9 @@ export async function executeAst({
   isInterrupted: boolean
 }> {
   try {
-    const execState = await (programMemoryOverride
-      ? enginelessExecutor(ast, programMemoryOverride, path)
-      : executor(ast, engineCommandManager, path))
+    const execState = await (isMock
+      ? executeMock(ast, usePrevMemory, path, variables)
+      : executeWithEngine(ast, engineCommandManager, path))
 
     await engineCommandManager.waitForAllCommands()
 

src/lang/modifyAst.test.ts

@@ -315,7 +315,7 @@ yo2 = hmm([identifierGuy + 5])`
     const startIndex = code.indexOf('100 + 100') + 1
     const { modifiedAst } = moveValueIntoNewVariable(
       ast,
-      execState.memory,
+      execState.variables,
       topLevelRange(startIndex, startIndex),
       'newVar'
     )
@@ -329,7 +329,7 @@ yo2 = hmm([identifierGuy + 5])`
     const startIndex = code.indexOf('2.8') + 1
     const { modifiedAst } = moveValueIntoNewVariable(
       ast,
-      execState.memory,
+      execState.variables,
       topLevelRange(startIndex, startIndex),
       'newVar'
     )
@@ -343,7 +343,7 @@ yo2 = hmm([identifierGuy + 5])`
     const startIndex = code.indexOf('def(')
     const { modifiedAst } = moveValueIntoNewVariable(
       ast,
-      execState.memory,
+      execState.variables,
       topLevelRange(startIndex, startIndex),
       'newVar'
     )
@@ -357,7 +357,7 @@ yo2 = hmm([identifierGuy + 5])`
     const startIndex = code.indexOf('jkl(') + 1
     const { modifiedAst } = moveValueIntoNewVariable(
       ast,
-      execState.memory,
+      execState.variables,
       topLevelRange(startIndex, startIndex),
       'newVar'
     )
@@ -371,7 +371,7 @@ yo2 = hmm([identifierGuy + 5])`
     const startIndex = code.indexOf('identifierGuy +') + 1
     const { modifiedAst } = moveValueIntoNewVariable(
       ast,
-      execState.memory,
+      execState.variables,
       topLevelRange(startIndex, startIndex),
       'newVar'
     )
@@ -557,7 +557,7 @@ describe('Testing deleteSegmentFromPipeExpression', () => {
     const modifiedAst = deleteSegmentFromPipeExpression(
       [],
       ast,
-      execState.memory,
+      execState.variables,
       code,
       pathToNode
     )
@@ -639,7 +639,7 @@ ${!replace1 ? `  |> ${line}\n` : ''}  |> angledLine([-65, ${
       const modifiedAst = deleteSegmentFromPipeExpression(
         dependentSegments,
         ast,
-        execState.memory,
+        execState.variables,
         code,
         pathToNode
       )
@@ -745,7 +745,7 @@ describe('Testing removeSingleConstraintInfo', () => {
         pathToNode,
         argPosition,
         ast,
-        execState.memory
+        execState.variables
       )
       if (!mod) return new Error('mod is undefined')
       const recastCode = recast(mod.modifiedAst)
@@ -794,7 +794,7 @@ describe('Testing removeSingleConstraintInfo', () => {
         pathToNode,
         argPosition,
         ast,
-        execState.memory
+        execState.variables
       )
       if (!mod) return new Error('mod is undefined')
       const recastCode = recast(mod.modifiedAst)
@@ -978,7 +978,7 @@ sketch002 = startSketchOn({
           codeRef: codeRefFromRange(range, ast),
           artifact,
         },
-        execState.memory,
+        execState.variables,
         async () => {
           await new Promise((resolve) => setTimeout(resolve, 100))
           return {

src/lang/modifyAst.ts

@@ -18,11 +18,11 @@ import {
   UnaryExpression,
   BinaryExpression,
   PathToNode,
-  ProgramMemory,
   SourceRange,
   sketchFromKclValue,
   isPathToNodeNumber,
   formatNumber,
+  VariableMap,
 } from './wasm'
 import {
   isNodeSafeToReplacePath,
@@ -1218,7 +1218,7 @@ export function replaceValueAtNodePath({
 
 export function moveValueIntoNewVariablePath(
   ast: Node<Program>,
-  programMemory: ProgramMemory,
+  memVars: VariableMap,
   pathToNode: PathToNode,
   variableName: string
 ): {
@@ -1231,11 +1231,7 @@ export function moveValueIntoNewVariablePath(
 
   if (!isSafe || value.type === 'Identifier') return { modifiedAst: ast }
 
-  const { insertIndex } = findAllPreviousVariablesPath(
-    ast,
-    programMemory,
-    pathToNode
-  )
+  const { insertIndex } = findAllPreviousVariablesPath(ast, memVars, pathToNode)
   let _node = structuredClone(ast)
   const boop = replacer(_node, variableName)
   if (trap(boop)) return { modifiedAst: ast }
@@ -1251,7 +1247,7 @@ export function moveValueIntoNewVariablePath(
 
 export function moveValueIntoNewVariable(
   ast: Node<Program>,
-  programMemory: ProgramMemory,
+  memVars: VariableMap,
   sourceRange: SourceRange,
   variableName: string
 ): {
@@ -1263,11 +1259,7 @@ export function moveValueIntoNewVariable(
   const { isSafe, value, replacer } = meta
   if (!isSafe || value.type === 'Identifier') return { modifiedAst: ast }
 
-  const { insertIndex } = findAllPreviousVariables(
-    ast,
-    programMemory,
-    sourceRange
-  )
+  const { insertIndex } = findAllPreviousVariables(ast, memVars, sourceRange)
   let _node = structuredClone(ast)
   const replaced = replacer(_node, variableName)
   if (trap(replaced)) return { modifiedAst: ast }
@@ -1289,7 +1281,7 @@ export function moveValueIntoNewVariable(
 export function deleteSegmentFromPipeExpression(
   dependentRanges: SourceRange[],
   modifiedAst: Node<Program>,
-  programMemory: ProgramMemory,
+  memVars: VariableMap,
   code: string,
   pathToNode: PathToNode
 ): Node<Program> | Error {
@@ -1321,7 +1313,7 @@ export function deleteSegmentFromPipeExpression(
       callExp.shallowPath,
       constraintInfo.argPosition,
       _modifiedAst,
-      programMemory
+      memVars
     )
     if (!transform) return
     _modifiedAst = transform.modifiedAst
@@ -1350,7 +1342,7 @@ export function removeSingleConstraintInfo(
   pathToCallExp: PathToNode,
   argDetails: SimplifiedArgDetails,
   ast: Node<Program>,
-  programMemory: ProgramMemory
+  memVars: VariableMap
 ):
   | {
       modifiedAst: Node<Program>
@@ -1367,7 +1359,7 @@ export function removeSingleConstraintInfo(
     ast,
     selectionRanges: [pathToCallExp],
     transformInfos: [transform],
-    programMemory,
+    memVars,
     referenceSegName: '',
   })
   if (err(retval)) return false
@@ -1377,7 +1369,7 @@ export function removeSingleConstraintInfo(
 export async function deleteFromSelection(
   ast: Node<Program>,
   selection: Selection,
-  programMemory: ProgramMemory,
+  variables: VariableMap,
   getFaceDetails: (id: string) => Promise<Models['FaceIsPlanar_type']> = () =>
     ({} as any)
 ): Promise<Node<Program> | Error> {
@@ -1506,7 +1498,7 @@ export async function deleteFromSelection(
               return
             }
             const sketchToPreserve = sketchFromKclValue(
-              programMemory.get(sketchName),
+              variables[sketchName],
               sketchName
             )
             if (err(sketchToPreserve)) return sketchToPreserve

src/lang/modifyAst/addEdgeTreatment.ts

@@ -298,7 +298,7 @@ export function getPathToExtrudeForSegmentSelection(
   const sketchVar = varDecNode.node.declaration.id.name
 
   const sketch = sketchFromKclValue(
-    dependencies.kclManager.programMemory.get(sketchVar),
+    dependencies.kclManager.variables[sketchVar],
     sketchVar
   )
   if (trap(sketch)) return sketch

src/lang/queryAst.test.ts

@@ -9,7 +9,6 @@ import {
   CallExpression,
   VariableDeclarator,
 } from './wasm'
-import { ProgramMemory } from 'lang/wasm'
 import {
   findAllPreviousVariables,
   isNodeSafeToReplace,
@@ -63,7 +62,7 @@ variableBelowShouldNotBeIncluded = 3
 
     const { variables, bodyPath, insertIndex } = findAllPreviousVariables(
       ast,
-      execState.memory,
+      execState.variables,
       topLevelRange(rangeStart, rangeStart)
     )
     expect(variables).toEqual([
@@ -398,7 +397,7 @@ part001 = startSketchAt([-1.41, 3.46])
       selection: {
         codeRef: codeRefFromRange(topLevelRange(100, 101), ast),
       },
-      programMemory: execState.memory,
+      memVars: execState.variables,
     })
     expect(result).toEqual(true)
   })
@@ -418,7 +417,7 @@ part001 = startSketchAt([-1.41, 3.46])
       selection: {
         codeRef: codeRefFromRange(topLevelRange(100, 101), ast),
       },
-      programMemory: execState.memory,
+      memVars: execState.variables,
     })
     expect(result).toEqual(true)
   })
@@ -432,7 +431,7 @@ part001 = startSketchAt([-1.41, 3.46])
       selection: {
         codeRef: codeRefFromRange(topLevelRange(10, 11), ast),
       },
-      programMemory: execState.memory,
+      memVars: execState.variables,
     })
     expect(result).toEqual(false)
   })
@@ -722,7 +721,7 @@ describe('Testing specific sketch getNodeFromPath workflow', () => {
     const sketchPathToNode = getNodePathFromSourceRange(ast, sketchRange)
     const modifiedAst = addCallExpressionsToPipe({
       node: ast,
-      programMemory: ProgramMemory.empty(),
+      variables: {},
       pathToNode: sketchPathToNode,
       expressions: [
         createCallExpressionStdLib(
@@ -777,7 +776,7 @@ describe('Testing specific sketch getNodeFromPath workflow', () => {
     const sketchPathToNode = getNodePathFromSourceRange(ast, sketchRange)
     const modifiedAst = addCloseToPipe({
       node: ast,
-      programMemory: ProgramMemory.empty(),
+      variables: {},
       pathToNode: sketchPathToNode,
     })
 

src/lang/queryAst.ts

@@ -13,7 +13,6 @@ import {
   PathToNode,
   PipeExpression,
   Program,
-  ProgramMemory,
   ReturnStatement,
   sketchFromKclValue,
   sketchFromKclValueOptional,
@@ -26,6 +25,7 @@ import {
   kclSettings,
   unitLenToUnitLength,
   unitAngToUnitAngle,
+  VariableMap,
 } from './wasm'
 import { getNodePathFromSourceRange } from 'lang/queryAstNodePathUtils'
 import { createIdentifier, splitPathAtLastIndex } from './modifyAst'
@@ -287,7 +287,7 @@ export interface PrevVariable<T> {
 
 export function findAllPreviousVariablesPath(
   ast: Program,
-  programMemory: ProgramMemory,
+  memVars: VariableMap,
   path: PathToNode,
   type: 'number' | 'string' = 'number'
 ): {
@@ -325,7 +325,7 @@ export function findAllPreviousVariablesPath(
   bodyItems?.forEach?.((item) => {
     if (item.type !== 'VariableDeclaration' || item.end > startRange) return
     const varName = item.declaration.id.name
-    const varValue = programMemory?.get(varName)
+    const varValue = memVars[varName]
     if (!varValue || typeof varValue?.value !== type) return
     variables.push({
       key: varName,
@@ -342,7 +342,7 @@ export function findAllPreviousVariablesPath(
 
 export function findAllPreviousVariables(
   ast: Program,
-  programMemory: ProgramMemory,
+  memVars: VariableMap,
   sourceRange: SourceRange,
   type: 'number' | 'string' = 'number'
 ): {
@@ -351,7 +351,7 @@ export function findAllPreviousVariables(
   insertIndex: number
 } {
   const path = getNodePathFromSourceRange(ast, sourceRange)
-  return findAllPreviousVariablesPath(ast, programMemory, path, type)
+  return findAllPreviousVariablesPath(ast, memVars, path, type)
 }
 
 type ReplacerFn = (
@@ -479,7 +479,7 @@ function isTypeInArrayExp(
 export function isLinesParallelAndConstrained(
   ast: Program,
   artifactGraph: ArtifactGraph,
-  programMemory: ProgramMemory,
+  memVars: VariableMap,
   primaryLine: Selection,
   secondaryLine: Selection
 ):
@@ -509,7 +509,7 @@ export function isLinesParallelAndConstrained(
     if (err(_varDec)) return _varDec
     const varDec = _varDec.node
     const varName = (varDec as VariableDeclaration)?.declaration.id?.name
-    const sg = sketchFromKclValue(programMemory?.get(varName), varName)
+    const sg = sketchFromKclValue(memVars[varName], varName)
     if (err(sg)) return sg
     const _primarySegment = getSketchSegmentFromSourceRange(
       sg,
@@ -589,11 +589,11 @@ export function isLinesParallelAndConstrained(
 export function hasExtrudeSketch({
   ast,
   selection,
-  programMemory,
+  memVars,
 }: {
   ast: Program
   selection: Selection
-  programMemory: ProgramMemory
+  memVars: VariableMap
 }): boolean {
   const varDecMeta = getNodeFromPath<VariableDeclaration>(
     ast,
@@ -607,7 +607,7 @@ export function hasExtrudeSketch({
   const varDec = varDecMeta.node
   if (varDec.type !== 'VariableDeclaration') return false
   const varName = varDec.declaration.id.name
-  const varValue = programMemory?.get(varName)
+  const varValue = memVars[varName]
   return (
     varValue?.type === 'Solid' ||
     !(sketchFromKclValueOptional(varValue, varName) instanceof Reason)

src/lang/std/sketch.test.ts

@@ -124,7 +124,7 @@ describe('testing changeSketchArguments', () => {
     const sourceStart = code.indexOf(lineToChange)
     const changeSketchArgsRetVal = changeSketchArguments(
       ast,
-      execState.memory,
+      execState.variables,
       {
         type: 'sourceRange',
         sourceRange: topLevelRange(
@@ -160,7 +160,7 @@ mySketch001 = startSketchOn('XY')
     expect(sourceStart).toBe(89)
     const newSketchLnRetVal = addNewSketchLn({
       node: ast,
-      programMemory: execState.memory,
+      variables: execState.variables,
       input: {
         type: 'straight-segment',
         from: [0, 0],
@@ -190,7 +190,7 @@ mySketch001 = startSketchOn('XY')
 
     const modifiedAst2 = addCloseToPipe({
       node: ast,
-      programMemory: execState.memory,
+      variables: execState.variables,
       pathToNode: [
         ['body', ''],
         [0, 'index'],

src/lang/std/sketch.ts

@@ -1,5 +1,4 @@
 import {
-  ProgramMemory,
   Path,
   Sketch,
   SourceRange,
@@ -14,6 +13,7 @@ import {
   Identifier,
   sketchFromKclValue,
   topLevelRange,
+  VariableMap,
 } from 'lang/wasm'
 import {
   getNodeFromPath,
@@ -355,7 +355,7 @@ function getTagKwArg(): SketchLineHelperKw['getTag'] {
 export const line: SketchLineHelperKw = {
   add: ({
     node,
-    previousProgramMemory,
+    variables,
     pathToNode,
     segmentInput,
     replaceExistingCallback,
@@ -494,7 +494,7 @@ export const line: SketchLineHelperKw = {
 export const lineTo: SketchLineHelperKw = {
   add: ({
     node,
-    previousProgramMemory,
+    variables,
     pathToNode,
     segmentInput,
     replaceExistingCallback,
@@ -1313,7 +1313,7 @@ export const angledLine: SketchLineHelper = {
 export const angledLineOfXLength: SketchLineHelper = {
   add: ({
     node,
-    previousProgramMemory,
+    variables,
     pathToNode,
     segmentInput,
     replaceExistingCallback,
@@ -1337,10 +1337,7 @@ export const angledLineOfXLength: SketchLineHelper = {
     const { node: varDec } = nodeMeta2
 
     const variableName = varDec.id.name
-    const sketch = sketchFromKclValue(
-      previousProgramMemory?.get(variableName),
-      variableName
-    )
+    const sketch = sketchFromKclValue(variables[variableName], variableName)
     if (err(sketch)) {
       return sketch
     }
@@ -1429,7 +1426,7 @@ export const angledLineOfXLength: SketchLineHelper = {
 export const angledLineOfYLength: SketchLineHelper = {
   add: ({
     node,
-    previousProgramMemory,
+    variables,
     pathToNode,
     segmentInput,
     replaceExistingCallback,
@@ -1452,10 +1449,7 @@ export const angledLineOfYLength: SketchLineHelper = {
     if (err(nodeMeta2)) return nodeMeta2
     const { node: varDec } = nodeMeta2
     const variableName = varDec.id.name
-    const sketch = sketchFromKclValue(
-      previousProgramMemory?.get(variableName),
-      variableName
-    )
+    const sketch = sketchFromKclValue(variables[variableName], variableName)
     if (err(sketch)) return sketch
 
     const angle = createLiteral(roundOff(getAngle(from, to), 0))
@@ -1793,7 +1787,7 @@ export const angledLineThatIntersects: SketchLineHelper = {
     }
     return new Error('not implemented')
   },
-  updateArgs: ({ node, pathToNode, input, previousProgramMemory }) => {
+  updateArgs: ({ node, pathToNode, input, variables }) => {
     if (input.type !== 'straight-segment') return STRAIGHT_SEGMENT_ERR
     const { to, from } = input
     const _node = { ...node }
@@ -1820,10 +1814,7 @@ export const angledLineThatIntersects: SketchLineHelper = {
 
     const { node: varDec } = nodeMeta2
     const varName = varDec.declaration.id.name
-    const sketch = sketchFromKclValue(
-      previousProgramMemory.get(varName),
-      varName
-    )
+    const sketch = sketchFromKclValue(variables[varName], varName)
     if (err(sketch)) return sketch
     const intersectPath = sketch.paths.find(
       ({ tag }: Path) => tag && tag.value === intersectTagName
@@ -1996,7 +1987,7 @@ export const sketchLineHelperMapKw: { [key: string]: SketchLineHelperKw } = {
 
 export function changeSketchArguments(
   node: Node<Program>,
-  programMemory: ProgramMemory,
+  variables: VariableMap,
   sourceRangeOrPath:
     | {
         type: 'sourceRange'
@@ -2030,7 +2021,7 @@ export function changeSketchArguments(
 
     return updateArgs({
       node: _node,
-      previousProgramMemory: programMemory,
+      variables,
       pathToNode: shallowPath,
       input,
     })
@@ -2047,7 +2038,7 @@ export function changeSketchArguments(
 
     return updateArgs({
       node: _node,
-      previousProgramMemory: programMemory,
+      variables,
       pathToNode: shallowPath,
       input,
     })
@@ -2112,7 +2103,7 @@ export function compareVec2Epsilon2(
 
 interface CreateLineFnCallArgs {
   node: Node<Program>
-  programMemory: ProgramMemory
+  variables: VariableMap
   input: SegmentInputs
   fnName: ToolTip
   pathToNode: PathToNode
@@ -2121,7 +2112,7 @@ interface CreateLineFnCallArgs {
 
 export function addNewSketchLn({
   node: _node,
-  programMemory: previousProgramMemory,
+  variables,
   fnName,
   pathToNode,
   input: segmentInput,
@@ -2151,7 +2142,7 @@ export function addNewSketchLn({
   )
   return add({
     node,
-    previousProgramMemory,
+    variables,
     pathToNode,
     segmentInput,
     spliceBetween,
@@ -2164,7 +2155,7 @@ export function addCallExpressionsToPipe({
   expressions,
 }: {
   node: Node<Program>
-  programMemory: ProgramMemory
+  variables: VariableMap
   pathToNode: PathToNode
   expressions: Node<CallExpression | CallExpressionKw>[]
 }) {
@@ -2188,7 +2179,7 @@ export function addCloseToPipe({
   pathToNode,
 }: {
   node: Program
-  programMemory: ProgramMemory
+  variables: VariableMap
   pathToNode: PathToNode
 }) {
   const _node = { ...node }
@@ -2209,7 +2200,7 @@ export function addCloseToPipe({
 
 export function replaceSketchLine({
   node,
-  programMemory,
+  variables,
   pathToNode: _pathToNode,
   fnName,
   segmentInput,
@@ -2217,7 +2208,7 @@ export function replaceSketchLine({
   referencedSegment,
 }: {
   node: Node<Program>
-  programMemory: ProgramMemory
+  variables: VariableMap
   pathToNode: PathToNode
   fnName: ToolTip
   segmentInput: SegmentInputs
@@ -2241,7 +2232,7 @@ export function replaceSketchLine({
       : sketchLineHelperMap[fnName]
   const addRetVal = add({
     node: _node,
-    previousProgramMemory: programMemory,
+    variables,
     pathToNode: _pathToNode,
     referencedSegment,
     segmentInput,

src/lang/std/sketchConstraints.test.ts

@@ -53,7 +53,7 @@ async function testingSwapSketchFnCall({
     return Promise.reject(new Error('transformInfos undefined'))
   const ast2 = transformAstSketchLines({
     ast,
-    programMemory: execState.memory,
+    memVars: execState.variables,
     selectionRanges: selections,
     transformInfos,
     referenceSegName: '',
@@ -373,7 +373,7 @@ part001 = startSketchOn('XY')
     const execState = await enginelessExecutor(assertParse(code))
     const index = code.indexOf('// normal-segment') - 7
     const sg = sketchFromKclValue(
-      execState.memory.get('part001'),
+      execState.variables['part001'],
       'part001'
     ) as Sketch
     const _segment = getSketchSegmentFromSourceRange(
@@ -393,7 +393,7 @@ part001 = startSketchOn('XY')
     const execState = await enginelessExecutor(assertParse(code))
     const index = code.indexOf('// segment-in-start') - 7
     const _segment = getSketchSegmentFromSourceRange(
-      sketchFromKclValue(execState.memory.get('part001'), 'part001') as Sketch,
+      sketchFromKclValue(execState.variables['part001'], 'part001') as Sketch,
       topLevelRange(index, index)
     )
     if (err(_segment)) throw _segment

src/lang/std/sketchcombos.test.ts

@@ -193,7 +193,7 @@ describe('testing transformAstForSketchLines for equal length constraint', () =>
         ast,
         selectionRanges: transformedSelection,
         transformInfos,
-        programMemory: execState.memory,
+        memVars: execState.variables,
       })
       if (err(newAst)) return Promise.reject(newAst)
 
@@ -356,7 +356,7 @@ part001 = startSketchOn('XY')
       ast,
       selectionRanges: makeSelections(selectionRanges),
       transformInfos,
-      programMemory: execState.memory,
+      memVars: execState.variables,
     })
     if (err(newAst)) return Promise.reject(newAst)
 
@@ -445,7 +445,7 @@ part001 = startSketchOn('XY')
       ast,
       selectionRanges: makeSelections(selectionRanges),
       transformInfos,
-      programMemory: execState.memory,
+      memVars: execState.variables,
       referenceSegName: '',
     })
     if (err(newAst)) return Promise.reject(newAst)
@@ -505,7 +505,7 @@ part001 = startSketchOn('XY')
       ast,
       selectionRanges: makeSelections(selectionRanges),
       transformInfos,
-      programMemory: execState.memory,
+      memVars: execState.variables,
       referenceSegName: '',
     })
     if (err(newAst)) return Promise.reject(newAst)
@@ -600,7 +600,7 @@ async function helperThing(
     ast,
     selectionRanges: makeSelections(selectionRanges),
     transformInfos,
-    programMemory: execState.memory,
+    memVars: execState.variables,
   })
 
   if (err(newAst)) return Promise.reject(newAst)

src/lang/std/sketchcombos.ts

@@ -17,13 +17,13 @@ import {
   BinaryPart,
   VariableDeclarator,
   PathToNode,
-  ProgramMemory,
   sketchFromKclValue,
   Literal,
   SourceRange,
   LiteralValue,
   recast,
   LabeledArg,
+  VariableMap,
 } from '../wasm'
 import { getNodeFromPath, getNodeFromPathCurry } from '../queryAst'
 import { getNodePathFromSourceRange } from 'lang/queryAstNodePathUtils'
@@ -1745,14 +1745,14 @@ export function transformSecondarySketchLinesTagFirst({
   ast,
   selectionRanges,
   transformInfos,
-  programMemory,
+  memVars,
   forceSegName,
   forceValueUsedInTransform,
 }: {
   ast: Node<Program>
   selectionRanges: Selections
   transformInfos: TransformInfo[]
-  programMemory: ProgramMemory
+  memVars: VariableMap
   forceSegName?: string
   forceValueUsedInTransform?: BinaryPart
 }):
@@ -1788,7 +1788,7 @@ export function transformSecondarySketchLinesTagFirst({
     },
     referencedSegmentRange: primarySelection,
     transformInfos,
-    programMemory,
+    memVars,
     referenceSegName: tag,
     forceValueUsedInTransform,
   })
@@ -1822,7 +1822,7 @@ export function transformAstSketchLines({
   ast,
   selectionRanges,
   transformInfos,
-  programMemory,
+  memVars,
   referenceSegName,
   forceValueUsedInTransform,
   referencedSegmentRange,
@@ -1830,7 +1830,7 @@ export function transformAstSketchLines({
   ast: Node<Program>
   selectionRanges: Selections | PathToNode[]
   transformInfos: TransformInfo[]
-  programMemory: ProgramMemory
+  memVars: VariableMap
   referenceSegName: string
   referencedSegmentRange?: SourceRange
   forceValueUsedInTransform?: BinaryPart
@@ -1946,7 +1946,7 @@ export function transformAstSketchLines({
     })
 
     const varName = varDec.node.id.name
-    let kclVal = programMemory.get(varName)
+    let kclVal = memVars[varName]
     let sketch
     if (kclVal?.type === 'Solid') {
       sketch = kclVal.value.sketch
@@ -1977,7 +1977,7 @@ export function transformAstSketchLines({
     // Note to ADAM: Here is where the replaceExisting call gets sent.
     const replacedSketchLine = replaceSketchLine({
       node: node,
-      programMemory,
+      variables: memVars,
       pathToNode: _pathToNode,
       referencedSegment,
       fnName: transformTo || (call.node.callee.name as ToolTip),

src/lang/std/std.test.ts

@@ -18,8 +18,8 @@ describe('testing angledLineThatIntersects', () => {
 }, %, $yo2)
 intersect = segEndX(yo2)`
     const execState = await enginelessExecutor(assertParse(code('-1')))
-    expect(execState.memory.get('intersect')?.value).toBe(1 + Math.sqrt(2))
+    expect(execState.variables['intersect']?.value).toBe(1 + Math.sqrt(2))
     const noOffset = await enginelessExecutor(assertParse(code('0')))
-    expect(noOffset.memory.get('intersect')?.value).toBeCloseTo(1)
+    expect(noOffset.variables['intersect']?.value).toBeCloseTo(1)
   })
 })

src/lang/std/stdTypes.ts

@@ -1,6 +1,5 @@
 import { ToolTip } from 'lang/langHelpers'
 import {
-  ProgramMemory,
   Path,
   SourceRange,
   Program,
@@ -10,14 +9,15 @@ import {
   Literal,
   BinaryPart,
   CallExpressionKw,
+  VariableMap,
 } from '../wasm'
 import { LineInputsType } from './sketchcombos'
 import { Node } from 'wasm-lib/kcl/bindings/Node'
 
 export interface ModifyAstBase {
   node: Node<Program>
-  // TODO #896: Remove ProgramMemory from this interface
-  previousProgramMemory: ProgramMemory
+  // TODO #896: Remove memory variables from this interface
+  variables: VariableMap
   pathToNode: PathToNode
 }
 

src/lang/wasm.test.ts

@@ -18,7 +18,7 @@ it('can execute parsed AST', async () => {
   expect(pResult.program).not.toEqual(null)
   const execState = await enginelessExecutor(pResult.program as Node<Program>)
   expect(err(execState)).toEqual(false)
-  expect(execState.memory.get('x')?.value).toEqual(1)
+  expect(execState.variables['x']?.value).toEqual(1)
 })
 
 it('formats numbers with units', () => {

src/lang/wasm.ts

@@ -3,7 +3,8 @@ import {
   parse_wasm,
   recast_wasm,
   format_number,
-  execute,
+  execute_with_engine,
+  execute_mock,
   kcl_lint,
   modify_ast_for_sketch_wasm,
   is_points_ccw,
@@ -281,6 +282,8 @@ export const assertParse = (code: string): Node<Program> => {
   return result.program
 }
 
+export type VariableMap = { [key in string]?: KclValue }
+
 export type PathToNode = [string | number, string][]
 
 export const isPathToNodeNumber = (
@@ -290,7 +293,7 @@ export const isPathToNodeNumber = (
 }
 
 export interface ExecState {
-  memory: ProgramMemory
+  variables: { [key in string]?: KclValue }
   operations: Operation[]
   artifacts: { [key in ArtifactId]?: RustArtifact }
   artifactCommands: ArtifactCommand[]
@@ -303,7 +306,7 @@ export interface ExecState {
  */
 export function emptyExecState(): ExecState {
   return {
-    memory: ProgramMemory.empty(),
+    variables: {},
     operations: [],
     artifacts: {},
     artifactCommands: [],
@@ -328,7 +331,7 @@ function execStateFromRust(
   }
 
   return {
-    memory: ProgramMemory.fromRaw(execOutcome.memory),
+    variables: execOutcome.variables,
     operations: execOutcome.operations,
     artifacts: execOutcome.artifacts,
     artifactCommands: execOutcome.artifactCommands,
@@ -336,6 +339,16 @@ function execStateFromRust(
   }
 }
 
+function mockExecStateFromRust(execOutcome: RustExecOutcome): ExecState {
+  return {
+    variables: execOutcome.variables,
+    operations: execOutcome.operations,
+    artifacts: execOutcome.artifacts,
+    artifactCommands: execOutcome.artifactCommands,
+    artifactGraph: new Map<ArtifactId, Artifact>(),
+  }
+}
+
 export type ArtifactGraph = Map<ArtifactId, Artifact>
 
 function rustArtifactGraphToMap(
@@ -354,203 +367,6 @@ export function defaultArtifactGraph(): ArtifactGraph {
   return new Map()
 }
 
-interface Memory {
-  [key: string]: KclValue | undefined
-}
-
-const ROOT_ENVIRONMENT_REF: EnvironmentRef = 0
-
-function emptyEnvironment(): Environment {
-  return { bindings: {}, parent: null }
-}
-
-function emptyRootEnvironment(): Environment {
-  return {
-    // This is dumb this is copied from rust.
-    bindings: {
-      ZERO: { type: 'Number', value: 0.0, __meta: [] },
-      QUARTER_TURN: { type: 'Number', value: 90.0, __meta: [] },
-      HALF_TURN: { type: 'Number', value: 180.0, __meta: [] },
-      THREE_QUARTER_TURN: { type: 'Number', value: 270.0, __meta: [] },
-    },
-    parent: null,
-  }
-}
-
-/**
- * This duplicates logic in Rust.  The hope is to keep ProgramMemory internals
- * isolated from the rest of the TypeScript code so that we can move it to Rust
- * in the future.
- */
-export class ProgramMemory {
-  private environments: Environment[]
-  private currentEnv: EnvironmentRef
-  private return: KclValue | null
-
-  /**
-   * Empty memory doesn't include prelude definitions.
-   */
-  static empty(): ProgramMemory {
-    return new ProgramMemory()
-  }
-
-  static fromRaw(raw: RawProgramMemory): ProgramMemory {
-    return new ProgramMemory(raw.environments, raw.currentEnv, raw.return)
-  }
-
-  constructor(
-    environments: Environment[] = [emptyRootEnvironment()],
-    currentEnv: EnvironmentRef = ROOT_ENVIRONMENT_REF,
-    returnVal: KclValue | null = null
-  ) {
-    this.environments = environments
-    this.currentEnv = currentEnv
-    this.return = returnVal
-  }
-
-  /**
-   * Returns a deep copy.
-   */
-  clone(): ProgramMemory {
-    return ProgramMemory.fromRaw(structuredClone(this.toRaw()))
-  }
-
-  has(name: string): boolean {
-    let envRef = this.currentEnv
-    while (true) {
-      const env = this.environments[envRef]
-      if (env.bindings.hasOwnProperty(name)) {
-        return true
-      }
-      if (!env.parent) {
-        break
-      }
-      envRef = env.parent
-    }
-    return false
-  }
-
-  get(name: string): KclValue | null {
-    let envRef = this.currentEnv
-    while (true) {
-      const env = this.environments[envRef]
-      if (env.bindings.hasOwnProperty(name)) {
-        return env.bindings[name] ?? null
-      }
-      if (!env.parent) {
-        break
-      }
-      envRef = env.parent
-    }
-    return null
-  }
-
-  set(name: string, value: KclValue): Error | null {
-    if (this.environments.length === 0) {
-      return new Error('No environment to set memory in')
-    }
-    const env = this.environments[this.currentEnv]
-    env.bindings[name] = value
-    return null
-  }
-
-  /**
-   * Returns a new ProgramMemory with only `KclValue`s that pass the
-   * predicate.  Values are deep copied.
-   *
-   * Note: Return value of the returned ProgramMemory is always null.
-   */
-  filterVariables(
-    keepPrelude: boolean,
-    predicate: (value: KclValue) => boolean
-  ): ProgramMemory | Error {
-    const environments: Environment[] = []
-    for (const [i, env] of this.environments.entries()) {
-      let bindings: Memory
-      if (i === ROOT_ENVIRONMENT_REF && keepPrelude) {
-        // Get prelude definitions.  Create these first so that they're always
-        // first in iteration order.
-        const memoryOrError = programMemoryInit()
-        if (err(memoryOrError)) return memoryOrError
-        bindings = memoryOrError.environments[0].bindings
-      } else {
-        bindings = emptyEnvironment().bindings
-      }
-
-      for (const [name, value] of Object.entries(env.bindings)) {
-        if (value === undefined) continue
-        // Check the predicate.
-        if (!predicate(value)) {
-          continue
-        }
-        // Deep copy.
-        bindings[name] = structuredClone(value)
-      }
-      environments.push({ bindings, parent: env.parent })
-    }
-    return new ProgramMemory(environments, this.currentEnv, null)
-  }
-
-  numEnvironments(): number {
-    return this.environments.length
-  }
-
-  numVariables(envRef: EnvironmentRef): number {
-    return Object.keys(this.environments[envRef]).length
-  }
-
-  /**
-   * Returns all variable entries in memory that are visible, in a flat
-   * structure.  If variables are shadowed, they're not visible, and therefore,
-   * not included.
-   *
-   * This should only be used to display in the MemoryPane UI.
-   */
-  visibleEntries(): Map<string, KclValue> {
-    const map = new Map<string, KclValue>()
-    let envRef = this.currentEnv
-    while (true) {
-      const env = this.environments[envRef]
-      for (const [name, value] of Object.entries(env.bindings)) {
-        if (value === undefined) continue
-        // Don't include shadowed variables.
-        if (!map.has(name)) {
-          map.set(name, value)
-        }
-      }
-      if (!env.parent) {
-        break
-      }
-      envRef = env.parent
-    }
-    return map
-  }
-
-  /**
-   * Returns true if any visible variables are a Sketch or Solid.
-   */
-  hasSketchOrSolid(): boolean {
-    for (const node of this.visibleEntries().values()) {
-      if (node.type === 'Solid' || node.type === 'Sketch') {
-        return true
-      }
-    }
-    return false
-  }
-
-  /**
-   * Return the representation that can be serialized to JSON.  This should only
-   * be used within this module.
-   */
-  toRaw(): RawProgramMemory {
-    return {
-      environments: this.environments,
-      currentEnv: this.currentEnv,
-      return: this.return,
-    }
-  }
-}
-
 // TODO: In the future, make the parameter be a KclValue.
 export function sketchFromKclValueOptional(
   obj: any,
@@ -590,24 +406,60 @@ export function sketchFromKclValue(
  * @param node The AST of the program to execute.
  * @param path The full path of the file being executed.  Use `null` for
  * expressions that don't have a file, like expressions in the command bar.
- * @param programMemoryOverride If this is not `null`, this will be used as the
- * initial program memory, and the execution will be engineless (AKA mock
- * execution).
  */
-export const executor = async (
+export const executeMock = async (
+  node: Node<Program>,
+  usePrevMemory?: boolean,
+  path?: string,
+  variables?: { [key in string]?: KclValue }
+): Promise<ExecState> => {
+  try {
+    if (!variables) {
+      variables = {}
+    }
+    if (usePrevMemory === undefined) {
+      usePrevMemory = true
+    }
+    const execOutcome: RustExecOutcome = await execute_mock(
+      JSON.stringify(node),
+      path,
+      JSON.stringify({ settings: await jsAppSettings() }),
+      usePrevMemory,
+      JSON.stringify(variables),
+      fileSystemManager
+    )
+    return mockExecStateFromRust(execOutcome)
+  } catch (e: any) {
+    return Promise.reject(errFromErrWithOutputs(e))
+  }
+}
+
+/**
+ * Execute a KCL program.
+ * @param node The AST of the program to execute.
+ * @param path The full path of the file being executed.  Use `null` for
+ * expressions that don't have a file, like expressions in the command bar.
+ */
+export const executeWithEngine = async (
   node: Node<Program>,
   engineCommandManager: EngineCommandManager,
-  path?: string,
-  programMemoryOverride: ProgramMemory | Error | null = null
+  path?: string
 ): Promise<ExecState> => {
-  if (programMemoryOverride !== null && err(programMemoryOverride))
-    return Promise.reject(programMemoryOverride)
-
-  // eslint-disable-next-line @typescript-eslint/no-floating-promises
-  if (programMemoryOverride !== null && err(programMemoryOverride))
-    return Promise.reject(programMemoryOverride)
-
   try {
+    const execOutcome: RustExecOutcome = await execute_with_engine(
+      JSON.stringify(node),
+      path,
+      JSON.stringify({ settings: await jsAppSettings() }),
+      engineCommandManager,
+      fileSystemManager
+    )
+    return execStateFromRust(execOutcome, node)
+  } catch (e: any) {
+    return Promise.reject(errFromErrWithOutputs(e))
+  }
+}
+
+const jsAppSettings = async () => {
   let jsAppSettings = default_app_settings()
   if (!TEST) {
     const lastSettingsSnapshot = await import(
@@ -617,19 +469,13 @@ export const executor = async (
       jsAppSettings = getAllCurrentSettings(lastSettingsSnapshot)
     }
   }
-    const execOutcome: RustExecOutcome = await execute(
-      JSON.stringify(node),
-      path,
-      JSON.stringify(programMemoryOverride?.toRaw() || null),
-      JSON.stringify({ settings: jsAppSettings }),
-      engineCommandManager,
-      fileSystemManager
-    )
-    return execStateFromRust(execOutcome, node)
-  } catch (e: any) {
-    console.log(e)
+  return jsAppSettings
+}
+
+const errFromErrWithOutputs = (e: any): KCLError => {
+  console.log('execute error', e)
   const parsed: KclErrorWithOutputs = JSON.parse(e.toString())
-    const kclError = new KCLError(
+  return new KCLError(
     parsed.error.kind,
     parsed.error.msg,
     firstSourceRange(parsed.error),
@@ -637,9 +483,6 @@ export const executor = async (
     parsed.artifactCommands,
     rustArtifactGraphToMap(parsed.artifactGraph)
   )
-
-    return Promise.reject(kclError)
-  }
 }
 
 export const kclLint = async (ast: Program): Promise<Array<Discovered>> => {
@@ -707,7 +550,6 @@ export const modifyAstForSketch = async (
       defaultArtifactGraph()
     )
 
-    console.log(kclError)
     return Promise.reject(kclError)
   }
 }
@@ -755,31 +597,6 @@ export function getTangentialArcToInfo({
   }
 }
 
-/**
- * Returns new ProgramMemory with prelude definitions.
- */
-export function programMemoryInit(): ProgramMemory | Error {
-  try {
-    const memory: RawProgramMemory = program_memory_init()
-    return new ProgramMemory(
-      memory.environments,
-      memory.currentEnv,
-      memory.return
-    )
-  } catch (e: any) {
-    console.log(e)
-    const parsed: RustKclError = JSON.parse(e.toString())
-    return new KCLError(
-      parsed.kind,
-      parsed.msg,
-      firstSourceRange(parsed),
-      [],
-      [],
-      defaultArtifactGraph()
-    )
-  }
-}
-
 export async function coreDump(
   coreDumpManager: CoreDumpManager,
   openGithubIssue: boolean = false

src/lib/commandBarConfigs/modelingCommandConfig.ts

@@ -576,7 +576,7 @@ export const modelingMachineCommandConfig: StateMachineCommandSetConfig<
             ast: structuredClone(kclManager.ast),
             selectionRanges,
             transformInfos: transforms,
-            programMemory: kclManager.programMemory,
+            memVars: kclManager.variables,
             referenceSegName: '',
           })
           if (err(sketched)) return KCL_DEFAULT_LENGTH

src/lib/exampleKcl.ts

@@ -51,16 +51,16 @@ sketch002 = startSketchOn(sketch001, seg03)
     center = [-1.25, 1],
     radius = mountingHoleDiameter / 2,
   }, %)
-  |> patternLinear2d({
+  |> patternLinear2d(
     instances = 2,
     distance = 2.5,
     axis = [-1, 0],
-  }, %)
-  |> patternLinear2d({
+  )
+  |> patternLinear2d(
     instances = 2,
     distance = 4,
     axis = [0, 1],
-  }, %)
+  )
   |> extrude(%, length = -thickness-.01)
 
 sketch003 = startSketchOn(sketch001, seg04)
@@ -68,11 +68,11 @@ sketch003 = startSketchOn(sketch001, seg04)
     center = [1, -1],
     radius = mountingHoleDiameter / 2,
   }, %)
-  |> patternLinear2d({
+  |> patternLinear2d(
     instances = 2,
     distance = 4,
     axis = [1, 0],
-  }, %)
+  )
   |> extrude(%, length = -thickness-0.1)
 `
 

src/lib/kclCommands.ts

@@ -6,7 +6,6 @@ import { FILE_EXT } from './constants'
 import { UnitLength_type } from '@kittycad/lib/dist/types/src/models'
 import { reportRejection } from './trap'
 import { IndexLoaderData } from './types'
-import { IS_NIGHTLY_OR_DEBUG } from 'routes/Settings'
 import { copyFileShareLink } from './links'
 
 interface OnSubmitProps {
@@ -137,7 +136,6 @@ export function kclCommands(commandProps: KclCommandConfig): Command[] {
     {
       name: 'share-file-link',
       displayName: 'Share current part (via Zoo link)',
-      hide: IS_NIGHTLY_OR_DEBUG ? undefined : 'desktop',
       description: 'Create a link that contains a copy of the current file.',
       groupId: 'code',
       needsReview: false,

src/lib/kclHelpers.test.ts

@@ -1,67 +1,55 @@
-import { ParseResult, ProgramMemory } from 'lang/wasm'
+import { ParseResult, VariableMap } from 'lang/wasm'
 import { getCalculatedKclExpressionValue } from './kclHelpers'
 
 describe('KCL expression calculations', () => {
   it('calculates a simple expression', async () => {
-    const actual = await getCalculatedKclExpressionValue({
-      value: '1 + 2',
-      programMemory: ProgramMemory.empty(),
-    })
+    const actual = await getCalculatedKclExpressionValue('1 + 2', {})
     const coercedActual = actual as Exclude<typeof actual, Error | ParseResult>
     expect(coercedActual).not.toHaveProperty('errors')
     expect(coercedActual.valueAsString).toEqual('3')
     expect(coercedActual?.astNode).toBeDefined()
   })
   it('calculates a simple expression with a variable', async () => {
-    const programMemory = ProgramMemory.empty()
-    programMemory.set('x', {
+    const variables: VariableMap = {}
+    variables['x'] = {
       type: 'Number',
       value: 2,
       __meta: [],
-    })
-    const actual = await getCalculatedKclExpressionValue({
-      value: '1 + x',
-      programMemory,
-    })
+    }
+    const actual = await getCalculatedKclExpressionValue('1 + x', variables)
     const coercedActual = actual as Exclude<typeof actual, Error | ParseResult>
     expect(coercedActual.valueAsString).toEqual('3')
     expect(coercedActual.astNode).toBeDefined()
   })
   it('returns NAN for an invalid expression', async () => {
-    const actual = await getCalculatedKclExpressionValue({
-      value: '1 + x',
-      programMemory: ProgramMemory.empty(),
-    })
+    const actual = await getCalculatedKclExpressionValue('1 + x', {})
     const coercedActual = actual as Exclude<typeof actual, Error | ParseResult>
     expect(coercedActual.valueAsString).toEqual('NAN')
     expect(coercedActual.astNode).toBeDefined()
   })
   it('returns NAN for an expression with an invalid variable', async () => {
-    const programMemory = ProgramMemory.empty()
-    programMemory.set('y', {
+    const variables: VariableMap = {}
+    variables['y'] = {
       type: 'Number',
       value: 2,
       __meta: [],
-    })
-    const actual = await getCalculatedKclExpressionValue({
-      value: '1 + x',
-      programMemory,
-    })
+    }
+    const actual = await getCalculatedKclExpressionValue('1 + x', variables)
     const coercedActual = actual as Exclude<typeof actual, Error | ParseResult>
     expect(coercedActual.valueAsString).toEqual('NAN')
     expect(coercedActual.astNode).toBeDefined()
   })
   it('calculates a more complex expression with a variable', async () => {
-    const programMemory = ProgramMemory.empty()
-    programMemory.set('x', {
+    const variables: VariableMap = {}
+    variables['x'] = {
       type: 'Number',
       value: 2,
       __meta: [],
-    })
-    const actual = await getCalculatedKclExpressionValue({
-      value: '(1 + x * x) * 2',
-      programMemory,
-    })
+    }
+    const actual = await getCalculatedKclExpressionValue(
+      '(1 + x * x) * 2',
+      variables
+    )
     const coercedActual = actual as Exclude<typeof actual, Error | ParseResult>
     expect(coercedActual.valueAsString).toEqual('10')
     expect(coercedActual.astNode).toBeDefined()

src/lib/kclHelpers.ts

@@ -1,48 +1,20 @@
 import { err } from './trap'
 import { engineCommandManager } from 'lib/singletons'
-import { parse, ProgramMemory, programMemoryInit, resultIsOk } from 'lang/wasm'
+import { parse, resultIsOk, VariableMap } from 'lang/wasm'
 import { PrevVariable } from 'lang/queryAst'
 import { executeAst } from 'lang/langHelpers'
 import { KclExpression } from './commandTypes'
 
 const DUMMY_VARIABLE_NAME = '__result__'
 
-export function programMemoryFromVariables(
-  variables: PrevVariable<string | number>[]
-): ProgramMemory | Error {
-  const memory = programMemoryInit()
-  if (err(memory)) return memory
-  for (const { key, value } of variables) {
-    const error = memory.set(
-      key,
-      typeof value === 'number'
-        ? {
-            type: 'Number',
-            value,
-            __meta: [],
-          }
-        : {
-            type: 'String',
-            value,
-            __meta: [],
-          }
-    )
-    if (err(error)) return error
-  }
-  return memory
-}
-
 /**
  * Calculate the value of the KCL expression,
  * given the value and the variables that are available
  */
-export async function getCalculatedKclExpressionValue({
-  value,
-  programMemory,
-}: {
-  value: string
-  programMemory: ProgramMemory
-}) {
+export async function getCalculatedKclExpressionValue(
+  value: string,
+  variables: VariableMap
+) {
   // Create a one-line program that assigns the value to a variable
   const dummyProgramCode = `const ${DUMMY_VARIABLE_NAME} = ${value}`
   const pResult = parse(dummyProgramCode)
@@ -53,7 +25,8 @@ export async function getCalculatedKclExpressionValue({
   const { execState } = await executeAst({
     ast,
     engineCommandManager,
-    programMemoryOverride: programMemory,
+    isMock: true,
+    variables,
   })
 
   // Find the variable declaration for the result
@@ -65,7 +38,7 @@ export async function getCalculatedKclExpressionValue({
   const variableDeclaratorAstNode =
     resultDeclaration?.type === 'VariableDeclaration' &&
     resultDeclaration?.declaration.init
-  const resultRawValue = execState.memory?.get(DUMMY_VARIABLE_NAME)?.value
+  const resultRawValue = execState.variables[DUMMY_VARIABLE_NAME]?.value
 
   return {
     astNode: variableDeclaratorAstNode,
@@ -74,17 +47,14 @@ export async function getCalculatedKclExpressionValue({
   }
 }
 
-export async function stringToKclExpression({
+export async function stringToKclExpression(
+  value: string,
+  variables: VariableMap
+) {
+  const calculatedResult = await getCalculatedKclExpressionValue(
     value,
-  programMemory,
-}: {
-  value: string
-  programMemory: ProgramMemory
-}) {
-  const calculatedResult = await getCalculatedKclExpressionValue({
-    value,
-    programMemory,
-  })
+    variables
+  )
   if (err(calculatedResult) || 'errors' in calculatedResult) {
     return calculatedResult
   } else if (!calculatedResult.astNode) {

src/lib/operations.ts

@@ -80,13 +80,13 @@ const prepareToEditExtrude: PrepareToEditCallback =
     }
 
     // Convert the length argument from a string to a KCL expression
-    const distanceResult = await stringToKclExpression({
-      value: codeManager.code.slice(
+    const distanceResult = await stringToKclExpression(
+      codeManager.code.slice(
         operation.labeledArgs?.['length']?.sourceRange[0],
         operation.labeledArgs?.['length']?.sourceRange[1]
       ),
-      programMemory: kclManager.programMemory.clone(),
-    })
+      {}
+    )
     if (err(distanceResult) || 'errors' in distanceResult) {
       return baseCommand
     }
@@ -163,13 +163,13 @@ const prepareToEditOffsetPlane: PrepareToEditCallback = async ({
   }
 
   // Convert the distance argument from a string to a KCL expression
-  const distanceResult = await stringToKclExpression({
-    value: codeManager.code.slice(
+  const distanceResult = await stringToKclExpression(
+    codeManager.code.slice(
       operation.labeledArgs.offset.sourceRange[0],
       operation.labeledArgs.offset.sourceRange[1]
     ),
-    programMemory: kclManager.programMemory.clone(),
-  })
+    {}
+  )
 
   if (err(distanceResult) || 'errors' in distanceResult) {
     return baseCommand

src/lib/testHelpers.ts

@@ -1,9 +1,9 @@
 import {
   Program,
-  ProgramMemory,
-  executor,
+  executeMock,
   SourceRange,
   ExecState,
+  VariableMap,
 } from '../lang/wasm'
 import { EngineCommandManager } from 'lang/std/engineConnection'
 import { EngineCommand } from 'lang/std/artifactGraph'
@@ -80,18 +80,9 @@ class MockEngineCommandManager {
 
 export async function enginelessExecutor(
   ast: Node<Program>,
-  pmo: ProgramMemory | Error = ProgramMemory.empty(),
-  path?: string
+  usePrevMemory?: boolean,
+  path?: string,
+  variables?: VariableMap
 ): Promise<ExecState> {
-  if (pmo !== null && err(pmo)) return Promise.reject(pmo)
-
-  const mockEngineCommandManager = new MockEngineCommandManager({
-    setIsStreamReady: () => {},
-    setMediaStream: () => {},
-  }) as any as EngineCommandManager
-  // eslint-disable-next-line @typescript-eslint/no-floating-promises
-  mockEngineCommandManager.startNewSession()
-  const execState = await executor(ast, mockEngineCommandManager, path, pmo)
-  await mockEngineCommandManager.waitForAllCommands()
-  return execState
+  return await executeMock(ast, usePrevMemory, path, variables)
 }

src/lib/useCalculateKclExpression.ts

@@ -5,10 +5,7 @@ import { findUniqueName } from 'lang/modifyAst'
 import { PrevVariable, findAllPreviousVariables } from 'lang/queryAst'
 import { Expr } from 'lang/wasm'
 import { useEffect, useRef, useState } from 'react'
-import {
-  getCalculatedKclExpressionValue,
-  programMemoryFromVariables,
-} from './kclHelpers'
+import { getCalculatedKclExpressionValue } from './kclHelpers'
 import { parse, resultIsOk } from 'lang/wasm'
 import { err } from 'lib/trap'
 
@@ -36,7 +33,7 @@ export function useCalculateKclExpression({
   newVariableInsertIndex: number
   setNewVariableName: (a: string) => void
 } {
-  const { programMemory, code } = useKclContext()
+  const { variables, code } = useKclContext()
   const { context } = useModelingContext()
   // If there is no selection, use the end of the code
   // so all variables are available
@@ -80,7 +77,7 @@ export function useCalculateKclExpression({
 
   useEffect(() => {
     if (
-      programMemory.has(newVariableName) ||
+      variables[newVariableName] ||
       newVariableName === '' ||
       !isValidVariableName(newVariableName)
     ) {
@@ -88,33 +85,22 @@ export function useCalculateKclExpression({
     } else {
       setIsNewVariableNameUnique(true)
     }
-  }, [programMemory, newVariableName])
+  }, [variables, newVariableName])
 
   useEffect(() => {
-    if (!programMemory) return
+    if (!variables) return
     const varInfo = findAllPreviousVariables(
       kclManager.ast,
-      kclManager.programMemory,
+      kclManager.variables,
       // If there is no selection, use the end of the code
       selectionRange || [code.length, code.length]
     )
     setAvailableVarInfo(varInfo)
-  }, [kclManager.ast, kclManager.programMemory, selectionRange])
+  }, [kclManager.ast, kclManager.variables, selectionRange])
 
   useEffect(() => {
     const execAstAndSetResult = async () => {
-      const programMemory = programMemoryFromVariables(
-        availableVarInfo.variables
-      )
-      if (programMemory instanceof Error) {
-        setCalcResult('NAN')
-        setValueNode(null)
-        return
-      }
-      const result = await getCalculatedKclExpressionValue({
-        value,
-        programMemory,
-      })
+      const result = await getCalculatedKclExpressionValue(value, {})
       if (result instanceof Error || 'errors' in result) {
         setCalcResult('NAN')
         setValueNode(null)
@@ -128,7 +114,7 @@ export function useCalculateKclExpression({
       setCalcResult('NAN')
       setValueNode(null)
     })
-  }, [value, availableVarInfo, code, kclManager.programMemory])
+  }, [value, availableVarInfo, code, kclManager.variables])
 
   return {
     valueNode,

src/lib/usePreviousVariables.ts

@@ -5,7 +5,7 @@ import { findAllPreviousVariables } from 'lang/queryAst'
 import { useEffect, useState } from 'react'
 
 export function usePreviousVariables() {
-  const { programMemory, code } = useKclContext()
+  const { variables, code } = useKclContext()
   const { context } = useModelingContext()
   const selectionRange = context.selectionRanges.graphSelections[0]?.codeRef
     ?.range || [code.length, code.length]
@@ -18,14 +18,14 @@ export function usePreviousVariables() {
   })
 
   useEffect(() => {
-    if (!programMemory || !selectionRange) return
+    if (!variables || !selectionRange) return
     const varInfo = findAllPreviousVariables(
       kclManager.ast,
-      kclManager.programMemory,
+      kclManager.variables,
       selectionRange
     )
     setPreviousVariablesInfo(varInfo)
-  }, [kclManager.ast, kclManager.programMemory, selectionRange])
+  }, [kclManager.ast, kclManager.variables, selectionRange])
 
   return previousVariablesInfo
 }

src/lib/wasm_lib_wrapper.ts

@@ -11,7 +11,8 @@ import {
   parse_wasm as ParseWasm,
   recast_wasm as RecastWasm,
   format_number as FormatNumber,
-  execute as Execute,
+  execute_with_engine as ExecuteWithEngine,
+  execute_mock as ExecuteMock,
   kcl_lint as KclLint,
   modify_ast_for_sketch_wasm as ModifyAstForSketch,
   is_points_ccw as IsPointsCcw,
@@ -57,8 +58,11 @@ export const recast_wasm: typeof RecastWasm = (...args) => {
 export const format_number: typeof FormatNumber = (...args) => {
   return getModule().format_number(...args)
 }
-export const execute: typeof Execute = (...args) => {
-  return getModule().execute(...args)
+export const execute_with_engine: typeof ExecuteWithEngine = (...args) => {
+  return getModule().execute_with_engine(...args)
+}
+export const execute_mock: typeof ExecuteMock = (...args) => {
+  return getModule().execute_mock(...args)
 }
 export const kcl_lint: typeof KclLint = (...args) => {
   return getModule().kcl_lint(...args)

src/machines/modelingMachine.ts

@@ -1,6 +1,5 @@
 import {
   PathToNode,
-  ProgramMemory,
   VariableDeclaration,
   VariableDeclarator,
   parse,
@@ -708,7 +707,7 @@ export const modelingMachine = setup({
         const modifiedAst = await deleteFromSelection(
           ast,
           selectionRanges.graphSelections[0],
-          kclManager.programMemory,
+          kclManager.variables,
           getFaceDetails
         )
         if (err(modifiedAst)) {
@@ -719,8 +718,7 @@ export const modelingMachine = setup({
         const testExecute = await executeAst({
           ast: modifiedAst,
           engineCommandManager,
-          // We make sure to send an empty program memory to denote we mean mock mode.
-          programMemoryOverride: ProgramMemory.empty(),
+          isMock: true,
         })
         if (testExecute.errors.length) {
           toast.error(errorMessage)
@@ -1087,7 +1085,7 @@ export const modelingMachine = setup({
           selectionRanges,
           'horizontal',
           kclManager.ast,
-          kclManager.programMemory
+          kclManager.variables
         )
         if (trap(constraint)) return false
         const { modifiedAst, pathToNodeMap } = constraint
@@ -1122,7 +1120,7 @@ export const modelingMachine = setup({
           selectionRanges,
           'vertical',
           kclManager.ast,
-          kclManager.programMemory
+          kclManager.variables
         )
         if (trap(constraint)) return false
         const { modifiedAst, pathToNodeMap } = constraint

src/wasm-lib/Cargo.lock

@@ -1779,7 +1779,7 @@ dependencies = [
 
 [[package]]
 name = "kcl-test-server"
-version = "0.1.20"
+version = "0.1.21"
 dependencies = [
  "anyhow",
  "hyper 0.14.32",

src/wasm-lib/Cargo.toml

@@ -33,6 +33,9 @@ tokio = { version = "1.41.1", features = ["rt-multi-thread", "macros", "time"] }
 twenty-twenty = "0.8"
 uuid = { version = "1.11.0", features = ["v4", "js", "serde"] }
 
+[features]
+dhat-heap = ["kcl-lib/dhat-heap"]
+
 [target.'cfg(target_arch = "wasm32")'.dependencies]
 console_error_panic_hook = "0.1.7"
 futures = "0.3.31"

src/wasm-lib/justfile

@@ -36,5 +36,11 @@ run-sim-test test_name:
     {{cita}} -p kcl-lib -- simulation_tests::{{test_name}}::unparse
     TWENTY_TWENTY=overwrite {{cita}} -p kcl-lib -- tests::{{test_name}}::kcl_test_execute
 
+overwrite-sim-test test_name:
+    EXPECTORATE=overwrite {{cita}} -p kcl-lib -- simulation_tests::{{test_name}}::parse
+    EXPECTORATE=overwrite {{cita}} -p kcl-lib -- simulation_tests::{{test_name}}::unparse
+    {{cita}} -p kcl-lib -- tests::{{test_name}}::kcl_test_execute
+    
+
 test:
     export RUST_BRACKTRACE="full" && cargo nextest run --workspace --test-threads=1

src/wasm-lib/kcl-test-server/Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "kcl-test-server"
 description = "A test server for KCL"
-version = "0.1.20"
+version = "0.1.21"
 edition = "2021"
 license = "MIT"
 

src/wasm-lib/kcl/src/docs/mod.rs

@@ -944,13 +944,7 @@ mod tests {
         let snippet = pattern_fn.to_autocomplete_snippet().unwrap();
         assert_eq!(
             snippet,
-            r#"patternCircular3d({
-	instances = ${0:10},
-	axis = [${1:3.14}, ${2:3.14}, ${3:3.14}],
-	center = [${4:3.14}, ${5:3.14}, ${6:3.14}],
-	arcDegrees = ${7:3.14},
-	rotateDuplicates = ${8:false},
-}, ${9:%})${}"#
+            r#"patternCircular3d(${0:%}, instances = ${1:10}, axis = [${2:3.14}, ${3:3.14}, ${4:3.14}], center = [${5:3.14}, ${6:3.14}, ${7:3.14}], arc_degrees = ${8:3.14}, rotate_duplicates = ${9:false})${}"#
         );
     }
 
@@ -1006,11 +1000,7 @@ mod tests {
         let snippet = pattern_fn.to_autocomplete_snippet().unwrap();
         assert_eq!(
             snippet,
-            r#"patternLinear2d({
-	instances = ${0:10},
-	distance = ${1:3.14},
-	axis = [${2:3.14}, ${3:3.14}],
-}, ${4:%})${}"#
+            r#"patternLinear2d(${0:%}, instances = ${1:10}, distance = ${2:3.14}, axis = [${3:3.14}, ${4:3.14}])${}"#
         );
     }
 

src/wasm-lib/kcl/src/execution/artifact/mermaid_tests.rs

@@ -462,98 +462,4 @@ impl ArtifactGraph {
 
         Ok(())
     }
-
-    /// Output the Mermaid mind map for the artifact graph.
-    ///
-    /// This is sometimes easier to read than the flowchart.  But since it
-    /// does a depth-first traversal starting from all the planes, it may
-    /// not include all the artifacts.  It also doesn't show edge direction.
-    /// It's useful for a high-level overview of the graph, not for
-    /// including all the information.
-    pub(crate) fn to_mermaid_mind_map(&self) -> Result<String, std::fmt::Error> {
-        let mut output = String::new();
-        output.push_str("```mermaid\n");
-        output.push_str("mindmap\n");
-        output.push_str("  root\n");
-
-        let mut ids_seen: fnv::FnvHashSet<ArtifactId> = Default::default();
-
-        for (_, artifact) in &self.map {
-            // Only the planes are roots.
-            let Artifact::Plane(_) = artifact else {
-                continue;
-            };
-            self.mind_map_artifact(&mut output, &mut ids_seen, artifact, "    ")?;
-        }
-
-        output.push_str("```\n");
-
-        Ok(output)
-    }
-
-    fn mind_map_artifact<W: Write>(
-        &self,
-        output: &mut W,
-        ids_seen: &mut fnv::FnvHashSet<ArtifactId>,
-        artifact: &Artifact,
-        prefix: &str,
-    ) -> std::fmt::Result {
-        match artifact {
-            Artifact::Plane(_plane) => {
-                ids_seen.clear();
-                writeln!(output, "{prefix}Plane")?;
-            }
-            Artifact::Path(_path) => {
-                writeln!(output, "{prefix}Path")?;
-            }
-            Artifact::Segment(_segment) => {
-                writeln!(output, "{prefix}Segment")?;
-            }
-            Artifact::Solid2d(_solid2d) => {
-                writeln!(output, "{prefix}Solid2d")?;
-            }
-            Artifact::StartSketchOnFace { .. } => {
-                writeln!(output, "{prefix}StartSketchOnFace")?;
-            }
-            Artifact::StartSketchOnPlane { .. } => {
-                writeln!(output, "{prefix}StartSketchOnPlane")?;
-            }
-            Artifact::Sweep(sweep) => {
-                writeln!(output, "{prefix}Sweep {:?}", sweep.sub_type)?;
-            }
-            Artifact::Wall(_wall) => {
-                writeln!(output, "{prefix}Wall")?;
-            }
-            Artifact::Cap(cap) => {
-                writeln!(output, "{prefix}Cap {:?}", cap.sub_type)?;
-            }
-            Artifact::SweepEdge(sweep_edge) => {
-                writeln!(output, "{prefix}SweepEdge {:?}", sweep_edge.sub_type,)?;
-            }
-            Artifact::EdgeCut(edge_cut) => {
-                writeln!(output, "{prefix}EdgeCut {:?}", edge_cut.sub_type)?;
-            }
-            Artifact::EdgeCutEdge(_edge_cut_edge) => {
-                writeln!(output, "{prefix}EdgeCutEdge")?;
-            }
-            Artifact::Helix(_) => {
-                writeln!(output, "{prefix}Helix")?;
-            }
-        }
-
-        if ids_seen.contains(&artifact.id()) {
-            return Ok(());
-        }
-
-        ids_seen.insert(artifact.id());
-
-        for child_id in artifact.child_ids() {
-            let Some(child_artifact) = self.map.get(&child_id) else {
-                continue;
-            };
-            self.mind_map_artifact(output, ids_seen, child_artifact, &format!("{}  ", prefix))?;
-        }
-
-        Ok(())
-    }
 }

src/wasm-lib/kcl/src/execution/cache.rs

@@ -11,28 +11,46 @@ use crate::{
     walk::Node as WalkNode,
 };
 
+use super::ProgramMemory;
+
 lazy_static::lazy_static! {
     /// A static mutable lock for updating the last successful execution state for the cache.
-    static ref OLD_AST_MEMORY: Arc<RwLock<Option<OldAstState>>> = Default::default();
+    static ref OLD_AST: Arc<RwLock<Option<OldAstState>>> = Default::default();
+    // The last successful run's memory. Not cleared after an unssuccessful run.
+    static ref PREV_MEMORY: Arc<RwLock<Option<ProgramMemory>>> = Default::default();
 }
 
 /// Read the old ast memory from the lock.
-pub(super) async fn read_old_ast_memory() -> Option<OldAstState> {
-    let old_ast = OLD_AST_MEMORY.read().await;
+pub(super) async fn read_old_ast() -> Option<OldAstState> {
+    let old_ast = OLD_AST.read().await;
     old_ast.clone()
 }
 
-pub(super) async fn write_old_ast_memory(old_state: OldAstState) {
-    let mut old_ast = OLD_AST_MEMORY.write().await;
+pub(super) async fn write_old_ast(old_state: OldAstState) {
+    let mut old_ast = OLD_AST.write().await;
     *old_ast = Some(old_state);
 }
 
+pub(super) async fn read_old_memory() -> Option<ProgramMemory> {
+    let old_mem = PREV_MEMORY.read().await;
+    old_mem.clone()
+}
+
+pub(super) async fn write_old_memory(mem: ProgramMemory) {
+    let mut old_mem = PREV_MEMORY.write().await;
+    *old_mem = Some(mem);
+}
+
 pub async fn bust_cache() {
-    let mut old_ast = OLD_AST_MEMORY.write().await;
-    // Set the cache to None.
+    let mut old_ast = OLD_AST.write().await;
     *old_ast = None;
 }
 
+pub async fn clear_mem_cache() {
+    let mut old_mem = PREV_MEMORY.write().await;
+    *old_mem = None;
+}
+
 /// Information for the caching an AST and smartly re-executing it if we can.
 #[derive(Debug, Clone)]
 pub struct CacheInformation<'a> {

src/wasm-lib/kcl/src/execution/exec_ast.rs

@@ -9,16 +9,17 @@ use crate::{
     execution::{
         annotations,
         cad_op::{OpArg, Operation},
+        memory,
         state::ModuleState,
-        BodyType, ExecState, ExecutorContext, KclValue, MemoryFunction, Metadata, ProgramMemory, TagEngineInfo,
-        TagIdentifier,
+        BodyType, EnvironmentRef, ExecState, ExecutorContext, KclValue, MemoryFunction, Metadata, ProgramMemory,
+        TagEngineInfo, TagIdentifier,
     },
     modules::{ModuleId, ModulePath, ModuleRepr},
     parsing::ast::types::{
         ArrayExpression, ArrayRangeExpression, BinaryExpression, BinaryOperator, BinaryPart, BodyItem, CallExpression,
         CallExpressionKw, Expr, FunctionExpression, IfExpression, ImportPath, ImportSelector, ItemVisibility,
         LiteralIdentifier, LiteralValue, MemberExpression, MemberObject, Node, NodeRef, NonCodeValue, ObjectExpression,
-        PipeExpression, TagDeclarator, UnaryExpression, UnaryOperator,
+        PipeExpression, Program, TagDeclarator, UnaryExpression, UnaryOperator,
     },
     source_range::SourceRange,
     std::{
@@ -113,20 +114,21 @@ impl ExecutorContext {
 
                     match &import_stmt.selector {
                         ImportSelector::List { items } => {
-                            let (_, module_memory, module_exports) = self
-                                .exec_module(module_id, exec_state, ExecutionKind::Isolated, source_range)
+                            let (env_ref, module_exports) = self
+                                .exec_module_for_items(module_id, exec_state, ExecutionKind::Isolated, source_range)
                                 .await?;
                             for import_item in items {
                                 // Extract the item from the module.
-                                let item =
-                                    module_memory
-                                        .get(&import_item.name.name, import_item.into())
+                                let item = exec_state
+                                    .memory()
+                                    .get_from(&import_item.name.name, env_ref, import_item.into())
                                     .map_err(|_err| {
                                         KclError::UndefinedValue(KclErrorDetails {
                                             message: format!("{} is not defined in module", import_item.name.name),
                                             source_ranges: vec![SourceRange::from(&import_item.name)],
                                         })
-                                        })?;
+                                    })?
+                                    .clone();
                                 // Check that the item is allowed to be imported.
                                 if !module_exports.contains(&import_item.name.name) {
                                     return Err(KclError::Semantic(KclErrorDetails {
@@ -140,8 +142,8 @@ impl ExecutorContext {
 
                                 // Add the item to the current module.
                                 exec_state.mut_memory().add(
-                                    import_item.identifier(),
-                                    item.clone(),
+                                    import_item.identifier().to_owned(),
+                                    item,
                                     SourceRange::from(&import_item.name),
                                 )?;
 
@@ -154,17 +156,21 @@ impl ExecutorContext {
                             }
                         }
                         ImportSelector::Glob(_) => {
-                            let (_, module_memory, module_exports) = self
-                                .exec_module(module_id, exec_state, ExecutionKind::Isolated, source_range)
+                            let (env_ref, module_exports) = self
+                                .exec_module_for_items(module_id, exec_state, ExecutionKind::Isolated, source_range)
                                 .await?;
                             for name in module_exports.iter() {
-                                let item = module_memory.get(name, source_range).map_err(|_err| {
+                                let item = exec_state
+                                    .memory()
+                                    .get_from(name, env_ref, source_range)
+                                    .map_err(|_err| {
                                         KclError::Internal(KclErrorDetails {
                                             message: format!("{} is not defined in module (but was exported?)", name),
                                             source_ranges: vec![source_range],
                                         })
-                                })?;
-                                exec_state.mut_memory().add(name, item.clone(), source_range)?;
+                                    })?
+                                    .clone();
+                                exec_state.mut_memory().add(name.to_owned(), item, source_range)?;
 
                                 if let ItemVisibility::Export = import_stmt.visibility {
                                     exec_state.mod_local.module_exports.push(name.clone());
@@ -177,7 +183,7 @@ impl ExecutorContext {
                                 value: module_id,
                                 meta: vec![source_range.into()],
                             };
-                            exec_state.mut_memory().add(&name, item, source_range)?;
+                            exec_state.mut_memory().add(name, item, source_range)?;
                         }
                     }
                     last_expr = None;
@@ -215,7 +221,9 @@ impl ExecutorContext {
                             StatementKind::Declaration { name: &var_name },
                         )
                         .await?;
-                    exec_state.mut_memory().add(&var_name, memory_item, source_range)?;
+                    exec_state
+                        .mut_memory()
+                        .add(var_name.clone(), memory_item, source_range)?;
 
                     // Track exports.
                     if let ItemVisibility::Export = variable_declaration.visibility {
@@ -225,6 +233,14 @@ impl ExecutorContext {
                 }
                 BodyItem::ReturnStatement(return_statement) => {
                     let metadata = Metadata::from(return_statement);
+
+                    if body_type == BodyType::Root {
+                        return Err(KclError::Semantic(KclErrorDetails {
+                            message: "Cannot return from outside a function.".to_owned(),
+                            source_ranges: vec![metadata.source_range],
+                        }));
+                    }
+
                     let value = self
                         .execute_expr(
                             &return_statement.argument,
@@ -233,7 +249,15 @@ impl ExecutorContext {
                             StatementKind::Expression,
                         )
                         .await?;
-                    exec_state.mut_memory().return_ = Some(value);
+                    exec_state
+                        .mut_memory()
+                        .add(memory::RETURN_NAME.to_owned(), value, metadata.source_range)
+                        .map_err(|_| {
+                            KclError::Semantic(KclErrorDetails {
+                                message: "Multiple returns from a single function.".to_owned(),
+                                source_ranges: vec![metadata.source_range],
+                            })
+                        })?;
                     last_expr = None;
                 }
             }
@@ -273,7 +297,8 @@ impl ExecutorContext {
                 let source = resolved_path.source(&self.fs, source_range).await?;
                 // TODO handle parsing errors properly
                 let parsed = crate::parsing::parse_str(&source, id).parse_errs_as_err()?;
-                exec_state.add_module(id, resolved_path, ModuleRepr::Kcl(parsed));
+                exec_state.add_module(id, resolved_path, ModuleRepr::Kcl(parsed, None));
+
                 Ok(id)
             }
             ImportPath::Foreign { .. } => {
@@ -296,43 +321,84 @@ impl ExecutorContext {
                 let id = exec_state.next_module_id();
                 let source = resolved_path.source(&self.fs, source_range).await?;
                 let parsed = crate::parsing::parse_str(&source, id).parse_errs_as_err().unwrap();
-                exec_state.add_module(id, resolved_path, ModuleRepr::Kcl(parsed));
+                exec_state.add_module(id, resolved_path, ModuleRepr::Kcl(parsed, None));
                 Ok(id)
             }
         }
     }
 
-    async fn exec_module(
+    async fn exec_module_for_items(
         &self,
         module_id: ModuleId,
         exec_state: &mut ExecState,
         exec_kind: ExecutionKind,
         source_range: SourceRange,
-    ) -> Result<(Option<KclValue>, ProgramMemory, Vec<String>), KclError> {
-        let old_units = exec_state.length_unit();
-        // TODO It sucks that we have to clone the whole module AST here
-        let info = exec_state.global.module_infos[&module_id].clone();
+    ) -> Result<(EnvironmentRef, Vec<String>), KclError> {
+        let path = exec_state.global.module_infos[&module_id].path.clone();
+        let mut repr = exec_state.global.module_infos[&module_id].take_repr();
+        // DON'T EARLY RETURN! We need to restore the module repr
 
-        match &info.repr {
-            ModuleRepr::Root => Err(KclError::ImportCycle(KclErrorDetails {
-                message: format!(
-                    "circular import of modules is not allowed: {} -> {}",
-                    exec_state
-                        .global
-                        .mod_loader
-                        .import_stack
-                        .iter()
-                        .map(|p| p.as_path().to_string_lossy())
-                        .collect::<Vec<_>>()
-                        .join(" -> "),
-                    info.path
-                ),
-                source_ranges: vec![source_range],
+        let result = match &mut repr {
+            ModuleRepr::Root => Err(exec_state.circular_import_error(&path, source_range)),
+            ModuleRepr::Kcl(_, Some((env_ref, items))) => Ok((*env_ref, items.clone())),
+            ModuleRepr::Kcl(program, cache) => self
+                .exec_module_from_ast(program, &path, exec_state, exec_kind, source_range)
+                .await
+                .map(|(_, er, items)| {
+                    *cache = Some((er, items.clone()));
+                    (er, items)
+                }),
+            ModuleRepr::Foreign(geom) => Err(KclError::Semantic(KclErrorDetails {
+                message: "Cannot import items from foreign modules".to_owned(),
+                source_ranges: vec![geom.source_range],
             })),
-            ModuleRepr::Kcl(program) => {
+            ModuleRepr::Dummy => unreachable!(),
+        };
+
+        exec_state.global.module_infos[&module_id].restore_repr(repr);
+        result
+    }
+
+    async fn exec_module_for_result(
+        &self,
+        module_id: ModuleId,
+        exec_state: &mut ExecState,
+        exec_kind: ExecutionKind,
+        source_range: SourceRange,
+    ) -> Result<Option<KclValue>, KclError> {
+        let path = exec_state.global.module_infos[&module_id].path.clone();
+        let repr = exec_state.global.module_infos[&module_id].take_repr();
+        // DON'T EARLY RETURN! We need to restore the module repr
+
+        let result = match &repr {
+            ModuleRepr::Root => Err(exec_state.circular_import_error(&path, source_range)),
+            ModuleRepr::Kcl(program, _) => self
+                .exec_module_from_ast(program, &path, exec_state, exec_kind, source_range)
+                .await
+                .map(|(val, _, _)| val),
+            ModuleRepr::Foreign(geom) => super::import::send_to_engine(geom.clone(), self)
+                .await
+                .map(|geom| Some(KclValue::ImportedGeometry(geom))),
+            ModuleRepr::Dummy => unreachable!(),
+        };
+
+        exec_state.global.module_infos[&module_id].restore_repr(repr);
+        result
+    }
+
+    async fn exec_module_from_ast(
+        &self,
+        program: &Node<Program>,
+        path: &ModulePath,
+        exec_state: &mut ExecState,
+        exec_kind: ExecutionKind,
+        source_range: SourceRange,
+    ) -> Result<(Option<KclValue>, EnvironmentRef, Vec<String>), KclError> {
+        let old_units = exec_state.length_unit();
         let mut local_state = ModuleState::new(&self.settings);
-                exec_state.global.mod_loader.enter_module(&info.path);
+        exec_state.global.mod_loader.enter_module(path);
         std::mem::swap(&mut exec_state.mod_local, &mut local_state);
+        exec_state.mut_memory().push_new_root_env();
         let original_execution = self.engine.replace_execution_kind(exec_kind);
 
         let result = self
@@ -341,13 +407,15 @@ impl ExecutorContext {
 
         let new_units = exec_state.length_unit();
         std::mem::swap(&mut exec_state.mod_local, &mut local_state);
-                exec_state.global.mod_loader.leave_module(&info.path);
+        let env_ref = exec_state.mut_memory().pop_env();
+        exec_state.global.mod_loader.leave_module(path);
         if !exec_kind.is_isolated() && new_units != old_units {
             self.engine.set_units(old_units.into(), Default::default()).await?;
         }
         self.engine.replace_execution_kind(original_execution);
 
-                let result = result.map_err(|err| {
+        result
+            .map_err(|err| {
                 if let KclError::ImportCycle(_) = err {
                     // It was an import cycle.  Keep the original message.
                     err.override_source_ranges(vec![source_range])
@@ -355,21 +423,14 @@ impl ExecutorContext {
                     KclError::Semantic(KclErrorDetails {
                         message: format!(
                             "Error loading imported file. Open it to view more details. {}: {}",
-                                info.path,
+                            path,
                             err.message()
                         ),
                         source_ranges: vec![source_range],
                     })
                 }
-                })?;
-
-                Ok((result, local_state.memory, local_state.module_exports))
-            }
-            ModuleRepr::Foreign(geom) => {
-                let geom = super::import::send_to_engine(geom.clone(), self).await?;
-                Ok((Some(KclValue::ImportedGeometry(geom)), ProgramMemory::new(), Vec::new()))
-            }
-        }
+            })
+            .map(|result| (result, env_ref, local_state.module_exports))
     }
 
     #[async_recursion]
@@ -387,10 +448,9 @@ impl ExecutorContext {
             Expr::Identifier(identifier) => {
                 let value = exec_state.memory().get(&identifier.name, identifier.into())?.clone();
                 if let KclValue::Module { value: module_id, meta } = value {
-                    let (result, _, _) = self
-                        .exec_module(module_id, exec_state, ExecutionKind::Normal, metadata.source_range)
-                        .await?;
-                    result.unwrap_or_else(|| {
+                    self.exec_module_for_result(module_id, exec_state, ExecutionKind::Normal, metadata.source_range)
+                        .await?
+                        .unwrap_or_else(|| {
                             // The module didn't have a return value.  Currently,
                             // the only way to have a return value is with the final
                             // statement being an expression statement.
@@ -409,17 +469,12 @@ impl ExecutorContext {
                 }
             }
             Expr::BinaryExpression(binary_expression) => binary_expression.get_result(exec_state, self).await?,
-            Expr::FunctionExpression(function_expression) => {
-                // Cloning memory here is crucial for semantics so that we close
-                // over variables.  Variables defined lexically later shouldn't
-                // be available to the function body.
-                KclValue::Function {
+            Expr::FunctionExpression(function_expression) => KclValue::Function {
                 expression: function_expression.clone(),
                 meta: vec![metadata.to_owned()],
                 func: None,
-                    memory: Box::new(exec_state.memory().clone()),
-                }
-            }
+                memory: exec_state.mut_memory().snapshot(),
+            },
             Expr::CallExpression(call_expression) => call_expression.execute(exec_state, self).await?,
             Expr::CallExpressionKw(call_expression) => call_expression.execute(exec_state, self).await?,
             Expr::PipeExpression(pipe_expression) => pipe_expression.get_result(exec_state, self).await?,
@@ -456,7 +511,7 @@ impl ExecutorContext {
                     .await?;
                 exec_state
                     .mut_memory()
-                    .add(&expr.label.name, result.clone(), init.into())?;
+                    .add(expr.label.name.clone(), result.clone(), init.into())?;
                 // TODO this lets us use the label as a variable name, but not as a tag in most cases
                 result
             }
@@ -886,7 +941,7 @@ impl Node<CallExpressionKw> {
                 };
 
                 // Attempt to call the function.
-                let result = {
+                let mut return_value = {
                     // Don't early-return in this block.
                     let result = func.std_lib_fn()(exec_state, args).await;
 
@@ -900,9 +955,8 @@ impl Node<CallExpressionKw> {
                         exec_state.mod_local.operations.push(op);
                     }
                     result
-                };
+                }?;
 
-                let mut return_value = result?;
                 update_memory_for_tags_of_geometry(&mut return_value, exec_state)?;
 
                 Ok(return_value)
@@ -912,7 +966,6 @@ impl Node<CallExpressionKw> {
                 // Clone the function so that we can use a mutable reference to
                 // exec_state.
                 let func = exec_state.memory().get(fn_name, source_range)?.clone();
-                let fn_dynamic_state = exec_state.mod_local.dynamic_state.merge(exec_state.memory());
 
                 // Track call operation.
                 let op_labeled_args = args
@@ -932,20 +985,14 @@ impl Node<CallExpressionKw> {
                         source_range: callsite,
                     });
 
-                let return_value = {
-                    let previous_dynamic_state =
-                        std::mem::replace(&mut exec_state.mod_local.dynamic_state, fn_dynamic_state);
-                    let result = func
+                let return_value = func
                     .call_fn_kw(args, exec_state, ctx.clone(), callsite)
                     .await
                     .map_err(|e| {
                         // Add the call expression to the source ranges.
                         // TODO currently ignored by the frontend
                         e.add_source_ranges(vec![source_range])
-                        });
-                    exec_state.mod_local.dynamic_state = previous_dynamic_state;
-                    result?
-                };
+                    })?;
 
                 let result = return_value.ok_or_else(move || {
                     let mut source_ranges: Vec<SourceRange> = vec![source_range];
@@ -1018,9 +1065,11 @@ impl Node<CallExpression> {
                     ctx.clone(),
                     exec_state.mod_local.pipe_value.clone().map(Arg::synthetic),
                 );
-                let result = {
+                let mut return_value = {
                     // Don't early-return in this block.
+                    exec_state.mut_memory().push_new_env_for_rust_call();
                     let result = func.std_lib_fn()(exec_state, args).await;
+                    exec_state.mut_memory().pop_env();
 
                     if let Some(mut op) = op {
                         op.set_std_lib_call_is_error(result.is_err());
@@ -1032,9 +1081,8 @@ impl Node<CallExpression> {
                         exec_state.mod_local.operations.push(op);
                     }
                     result
-                };
+                }?;
 
-                let mut return_value = result?;
                 update_memory_for_tags_of_geometry(&mut return_value, exec_state)?;
 
                 Ok(return_value)
@@ -1044,7 +1092,6 @@ impl Node<CallExpression> {
                 // Clone the function so that we can use a mutable reference to
                 // exec_state.
                 let func = exec_state.memory().get(fn_name, source_range)?.clone();
-                let fn_dynamic_state = exec_state.mod_local.dynamic_state.merge(exec_state.memory());
 
                 // Track call operation.
                 exec_state
@@ -1059,17 +1106,11 @@ impl Node<CallExpression> {
                         source_range: callsite,
                     });
 
-                let return_value = {
-                    let previous_dynamic_state =
-                        std::mem::replace(&mut exec_state.mod_local.dynamic_state, fn_dynamic_state);
-                    let result = func.call_fn(fn_args, exec_state, ctx.clone()).await.map_err(|e| {
+                let return_value = func.call_fn(fn_args, exec_state, ctx.clone()).await.map_err(|e| {
                     // Add the call expression to the source ranges.
                     // TODO currently ignored by the frontend
                     e.add_source_ranges(vec![source_range])
-                    });
-                    exec_state.mod_local.dynamic_state = previous_dynamic_state;
-                    result?
-                };
+                })?;
 
                 let result = return_value.ok_or_else(move || {
                     let mut source_ranges: Vec<SourceRange> = vec![source_range];
@@ -1103,15 +1144,29 @@ fn update_memory_for_tags_of_geometry(result: &mut KclValue, exec_state: &mut Ex
     match result {
         KclValue::Sketch { value: ref mut sketch } => {
             for (_, tag) in sketch.tags.iter() {
-                exec_state.mut_memory().update_tag(&tag.value, tag.clone())?;
+                exec_state
+                    .mut_memory()
+                    .insert_or_update(tag.value.clone(), KclValue::TagIdentifier(Box::new(tag.clone())));
             }
         }
         KclValue::Solid { ref mut value } => {
             for v in &value.value {
                 if let Some(tag) = v.get_tag() {
                     // Get the past tag and update it.
-                    let mut t = if let Some(t) = value.sketch.tags.get(&tag.name) {
-                        t.clone()
+                    let tag_id = if let Some(t) = value.sketch.tags.get(&tag.name) {
+                        let mut t = t.clone();
+                        let Some(ref info) = t.info else {
+                            return Err(KclError::Internal(KclErrorDetails {
+                                message: format!("Tag {} does not have path info", tag.name),
+                                source_ranges: vec![tag.into()],
+                            }));
+                        };
+
+                        let mut info = info.clone();
+                        info.surface = Some(v.clone());
+                        info.sketch = value.id;
+                        t.info = Some(info);
+                        t
                     } else {
                         // It's probably a fillet or a chamfer.
                         // Initialize it.
@@ -1129,29 +1184,40 @@ fn update_memory_for_tags_of_geometry(result: &mut KclValue, exec_state: &mut Ex
                         }
                     };
 
-                    let Some(ref info) = t.info else {
-                        return Err(KclError::Semantic(KclErrorDetails {
-                            message: format!("Tag {} does not have path info", tag.name),
-                            source_ranges: vec![tag.into()],
-                        }));
-                    };
-
-                    let mut info = info.clone();
-                    info.surface = Some(v.clone());
-                    info.sketch = value.id;
-                    t.info = Some(info);
-
-                    exec_state.mut_memory().update_tag(&tag.name, t.clone())?;
+                    exec_state
+                        .mut_memory()
+                        .insert_or_update(tag.name.clone(), KclValue::TagIdentifier(Box::new(tag_id.clone())));
 
                     // update the sketch tags.
-                    value.sketch.tags.insert(tag.name.clone(), t);
+                    value.sketch.tags.insert(tag.name.clone(), tag_id);
                 }
             }
 
             // Find the stale sketch in memory and update it.
-            let cur_env_index = exec_state.memory().current_env.index();
-            if let Some(current_env) = exec_state.mut_memory().environments.get_mut(cur_env_index) {
-                current_env.update_sketch_tags(&value.sketch);
+            if !value.sketch.tags.is_empty() {
+                let updates: Vec<_> = exec_state
+                    .memory()
+                    .find_all_in_current_env(|v| match v {
+                        KclValue::Sketch { value: sk } => sk.artifact_id == value.sketch.artifact_id,
+                        _ => false,
+                    })
+                    .map(|(k, v)| {
+                        let mut sketch = v.as_sketch().unwrap().clone();
+                        for (tag_name, tag_id) in value.sketch.tags.iter() {
+                            sketch.tags.insert(tag_name.clone(), tag_id.clone());
+                        }
+                        (
+                            k.clone(),
+                            KclValue::Sketch {
+                                value: Box::new(sketch),
+                            },
+                        )
+                    })
+                    .collect();
+
+                updates
+                    .into_iter()
+                    .for_each(|(k, v)| exec_state.mut_memory().insert_or_update(k, v))
             }
         }
         _ => {}
@@ -1171,7 +1237,7 @@ impl Node<TagDeclarator> {
 
         exec_state
             .mut_memory()
-            .add(&self.name, memory_item.clone(), self.into())?;
+            .add(self.name.clone(), memory_item.clone(), self.into())?;
 
         Ok(self.into())
     }
@@ -1450,8 +1516,8 @@ impl Node<PipeExpression> {
 fn assign_args_to_params(
     function_expression: NodeRef<'_, FunctionExpression>,
     args: Vec<Arg>,
-    mut fn_memory: ProgramMemory,
-) -> Result<ProgramMemory, KclError> {
+    fn_memory: &mut ProgramMemory,
+) -> Result<(), KclError> {
     let num_args = function_expression.number_of_args();
     let (min_params, max_params) = num_args.into_inner();
     let n = args.len();
@@ -1475,14 +1541,18 @@ fn assign_args_to_params(
     for (index, param) in function_expression.params.iter().enumerate() {
         if let Some(arg) = args.get(index) {
             // Argument was provided.
-            fn_memory.add(&param.identifier.name, arg.value.clone(), (&param.identifier).into())?;
+            fn_memory.add(
+                param.identifier.name.clone(),
+                arg.value.clone(),
+                (&param.identifier).into(),
+            )?;
         } else {
             // Argument was not provided.
             if let Some(ref default_val) = param.default_value {
                 // If the corresponding parameter is optional,
                 // then it's fine, the user doesn't need to supply it.
                 fn_memory.add(
-                    &param.identifier.name,
+                    param.identifier.name.clone(),
                     default_val.clone().into(),
                     (&param.identifier).into(),
                 )?;
@@ -1493,14 +1563,14 @@ fn assign_args_to_params(
             }
         }
     }
-    Ok(fn_memory)
+    Ok(())
 }
 
 fn assign_args_to_params_kw(
     function_expression: NodeRef<'_, FunctionExpression>,
     mut args: crate::std::args::KwArgs,
-    mut fn_memory: ProgramMemory,
-) -> Result<ProgramMemory, KclError> {
+    fn_memory: &mut ProgramMemory,
+) -> Result<(), KclError> {
     // Add the arguments to the memory.  A new call frame should have already
     // been created.
     let source_ranges = vec![function_expression.into()];
@@ -1522,7 +1592,7 @@ fn assign_args_to_params_kw(
                     }
                 },
             };
-            fn_memory.add(&param.identifier.name, arg_val, (&param.identifier).into())?;
+            fn_memory.add(param.identifier.name.clone(), arg_val, (&param.identifier).into())?;
         } else {
             let Some(unlabeled) = args.unlabeled.take() else {
                 let param_name = &param.identifier.name;
@@ -1540,18 +1610,18 @@ fn assign_args_to_params_kw(
                 });
             };
             fn_memory.add(
-                &param.identifier.name,
+                param.identifier.name.clone(),
                 unlabeled.value.clone(),
                 (&param.identifier).into(),
             )?;
         }
     }
-    Ok(fn_memory)
+    Ok(())
 }
 
 pub(crate) async fn call_user_defined_function(
     args: Vec<Arg>,
-    memory: &ProgramMemory,
+    memory: EnvironmentRef,
     function_expression: NodeRef<'_, FunctionExpression>,
     exec_state: &mut ExecState,
     ctx: &ExecutorContext,
@@ -1559,29 +1629,32 @@ pub(crate) async fn call_user_defined_function(
     // Create a new environment to execute the function body in so that local
     // variables shadow variables in the parent scope.  The new environment's
     // parent should be the environment of the closure.
-    let mut body_memory = memory.clone();
-    let body_env = body_memory.new_env_for_call(memory.current_env);
-    body_memory.current_env = body_env;
-    let fn_memory = assign_args_to_params(function_expression, args, body_memory)?;
+    exec_state.mut_memory().push_new_env_for_call(memory);
+    if let Err(e) = assign_args_to_params(function_expression, args, exec_state.mut_memory()) {
+        exec_state.mut_memory().pop_env();
+        return Err(e);
+    }
 
     // Execute the function body using the memory we just created.
-    let (result, fn_memory) = {
-        let previous_memory = std::mem::replace(&mut exec_state.mod_local.memory, fn_memory);
     let result = ctx
         .exec_program(&function_expression.body, exec_state, BodyType::Block)
         .await;
+    let result = result.map(|_| {
+        exec_state
+            .memory()
+            .get(memory::RETURN_NAME, function_expression.as_source_range())
+            .ok()
+            .cloned()
+    });
     // Restore the previous memory.
-        let fn_memory = std::mem::replace(&mut exec_state.mod_local.memory, previous_memory);
+    exec_state.mut_memory().pop_env();
 
-        (result, fn_memory)
-    };
-
-    result.map(|_| fn_memory.return_)
+    result
 }
 
 pub(crate) async fn call_user_defined_function_kw(
     args: crate::std::args::KwArgs,
-    memory: &ProgramMemory,
+    memory: EnvironmentRef,
     function_expression: NodeRef<'_, FunctionExpression>,
     exec_state: &mut ExecState,
     ctx: &ExecutorContext,
@@ -1589,31 +1662,34 @@ pub(crate) async fn call_user_defined_function_kw(
     // Create a new environment to execute the function body in so that local
     // variables shadow variables in the parent scope.  The new environment's
     // parent should be the environment of the closure.
-    let mut body_memory = memory.clone();
-    let body_env = body_memory.new_env_for_call(memory.current_env);
-    body_memory.current_env = body_env;
-    let fn_memory = assign_args_to_params_kw(function_expression, args, body_memory)?;
+    exec_state.mut_memory().push_new_env_for_call(memory);
+    if let Err(e) = assign_args_to_params_kw(function_expression, args, exec_state.mut_memory()) {
+        exec_state.mut_memory().pop_env();
+        return Err(e);
+    }
 
     // Execute the function body using the memory we just created.
-    let (result, fn_memory) = {
-        let previous_memory = std::mem::replace(&mut exec_state.mod_local.memory, fn_memory);
     let result = ctx
         .exec_program(&function_expression.body, exec_state, BodyType::Block)
         .await;
+    let result = result.map(|_| {
+        exec_state
+            .memory()
+            .get(memory::RETURN_NAME, function_expression.as_source_range())
+            .ok()
+            .cloned()
+    });
     // Restore the previous memory.
-        let fn_memory = std::mem::replace(&mut exec_state.mod_local.memory, previous_memory);
+    exec_state.mut_memory().pop_env();
 
-        (result, fn_memory)
-    };
-
-    result.map(|_| fn_memory.return_)
+    result
 }
 
 /// A function being used as a parameter into a stdlib function.  This is a
 /// closure, plus everything needed to execute it.
 pub struct FunctionParam<'a> {
     pub inner: Option<&'a MemoryFunction>,
-    pub memory: ProgramMemory,
+    pub memory: EnvironmentRef,
     pub fn_expr: crate::parsing::ast::types::BoxNode<FunctionExpression>,
     pub meta: Vec<Metadata>,
     pub ctx: ExecutorContext,
@@ -1624,7 +1700,7 @@ impl FunctionParam<'_> {
         if let Some(inner) = self.inner {
             inner(
                 args,
-                self.memory.clone(),
+                self.memory,
                 self.fn_expr.clone(),
                 self.meta.clone(),
                 exec_state,
@@ -1632,7 +1708,7 @@ impl FunctionParam<'_> {
             )
             .await
         } else {
-            call_user_defined_function(args, &self.memory, self.fn_expr.as_ref(), exec_state, &self.ctx).await
+            call_user_defined_function(args, self.memory, self.fn_expr.as_ref(), exec_state, &self.ctx).await
         }
     }
 }
@@ -1650,8 +1726,12 @@ impl JsonSchema for FunctionParam<'_> {
 
 #[cfg(test)]
 mod test {
+    use crate::{
+        execution::parse_execute,
+        parsing::ast::types::{DefaultParamVal, Identifier, Parameter},
+    };
+
     use super::*;
-    use crate::parsing::ast::types::{DefaultParamVal, Identifier, Parameter};
 
     #[test]
     fn test_assign_args_to_params() {
@@ -1690,7 +1770,7 @@ mod test {
             let mut program_memory = ProgramMemory::new();
             for (name, item) in items {
                 program_memory
-                    .add(name.as_str(), item.clone(), SourceRange::default())
+                    .add(name.clone(), item.clone(), SourceRange::default())
                     .unwrap();
             }
             program_memory
@@ -1775,11 +1855,26 @@ mod test {
                 digest: None,
             });
             let args = args.into_iter().map(Arg::synthetic).collect();
-            let actual = assign_args_to_params(func_expr, args, ProgramMemory::new());
+            let mut actual = ProgramMemory::new();
+            let actual = assign_args_to_params(func_expr, args, &mut actual).map(|_| actual);
             assert_eq!(
                 actual, expected,
                 "failed test '{test_name}':\ngot {actual:?}\nbut expected\n{expected:?}"
             );
         }
     }
+
+    #[tokio::test(flavor = "multi_thread")]
+    async fn multiple_returns() {
+        let program = r#"fn foo() {
+  return 0
+  return 42
+}
+
+a = foo()
+"#;
+
+        let result = parse_execute(program).await;
+        assert!(result.unwrap_err().to_string().contains("return"));
+    }
 }

src/wasm-lib/kcl/src/execution/geometry.rs

@@ -564,29 +564,8 @@ pub struct Solid {
 }
 
 impl Solid {
-    pub(crate) fn get_all_edge_cut_ids(&self) -> Vec<uuid::Uuid> {
-        self.edge_cuts.iter().map(|foc| foc.id()).collect()
-    }
-}
-
-/// An solid ID and its fillet and chamfer IDs.  This is needed for lazy
-/// fillet evaluation.
-#[derive(Debug, Clone, PartialEq, Eq, Deserialize, Serialize)]
-pub struct SolidLazyIds {
-    pub solid_id: uuid::Uuid,
-    pub sketch_id: uuid::Uuid,
-    /// Chamfers or fillets on this solid.
-    #[serde(default, skip_serializing_if = "Vec::is_empty")]
-    pub edge_cuts: Vec<uuid::Uuid>,
-}
-
-impl From<&Solid> for SolidLazyIds {
-    fn from(eg: &Solid) -> Self {
-        Self {
-            solid_id: eg.id,
-            sketch_id: eg.sketch.id,
-            edge_cuts: eg.edge_cuts.iter().map(|foc| foc.id()).collect(),
-        }
+    pub(crate) fn get_all_edge_cut_ids(&self) -> impl Iterator<Item = uuid::Uuid> + '_ {
+        self.edge_cuts.iter().map(|foc| foc.id())
     }
 }
 

src/wasm-lib/kcl/src/execution/import.rs

@@ -166,7 +166,7 @@ pub async fn import_foreign(
 pub struct PreImportedGeometry {
     id: Uuid,
     command: mcmd::ImportFiles,
-    source_range: SourceRange,
+    pub source_range: SourceRange,
 }
 
 pub async fn send_to_engine(pre: PreImportedGeometry, ctxt: &ExecutorContext) -> Result<ImportedGeometry, KclError> {

src/wasm-lib/kcl/src/execution/kcl_value.rs

@@ -6,7 +6,7 @@ use serde::{Deserialize, Serialize};
 
 use crate::{
     errors::KclErrorDetails,
-    exec::{ProgramMemory, Sketch},
+    exec::Sketch,
     execution::{
         Face, Helix, ImportedGeometry, MemoryFunction, Metadata, Plane, SketchSet, Solid, SolidSet, TagIdentifier,
     },
@@ -18,6 +18,8 @@ use crate::{
     ExecState, ExecutorContext, KclError, ModuleId, SourceRange,
 };
 
+use super::memory::EnvironmentRef;
+
 pub type KclObjectFields = HashMap<String, KclValue>;
 
 /// Any KCL value.
@@ -94,7 +96,7 @@ pub enum KclValue {
         func: Option<MemoryFunction>,
         #[schemars(skip)]
         expression: crate::parsing::ast::types::BoxNode<FunctionExpression>,
-        memory: Box<ProgramMemory>,
+        memory: EnvironmentRef,
         #[serde(rename = "__meta")]
         meta: Vec<Metadata>,
     },
@@ -108,6 +110,12 @@ pub enum KclValue {
         #[serde(rename = "__meta")]
         meta: Vec<Metadata>,
     },
+    // Only used for memory management. Should never be visible outside of the memory module.
+    Tombstone {
+        value: (),
+        #[serde(rename = "__meta")]
+        meta: Vec<Metadata>,
+    },
 }
 
 impl From<SketchSet> for KclValue {
@@ -166,6 +174,7 @@ impl From<KclValue> for Vec<SourceRange> {
             KclValue::Module { meta, .. } => to_vec_sr(&meta),
             KclValue::Uuid { meta, .. } => to_vec_sr(&meta),
             KclValue::KclNone { meta, .. } => to_vec_sr(&meta),
+            KclValue::Tombstone { .. } => unreachable!("Tombstone SourceRange"),
         }
     }
 }
@@ -197,6 +206,7 @@ impl From<&KclValue> for Vec<SourceRange> {
             KclValue::Object { meta, .. } => to_vec_sr(meta),
             KclValue::Module { meta, .. } => to_vec_sr(meta),
             KclValue::KclNone { meta, .. } => to_vec_sr(meta),
+            KclValue::Tombstone { .. } => unreachable!("Tombstone &SourceRange"),
         }
     }
 }
@@ -224,6 +234,7 @@ impl KclValue {
             KclValue::Function { meta, .. } => meta.clone(),
             KclValue::Module { meta, .. } => meta.clone(),
             KclValue::KclNone { meta, .. } => meta.clone(),
+            KclValue::Tombstone { .. } => unreachable!("Tombstone Metadata"),
         }
     }
 
@@ -291,6 +302,7 @@ impl KclValue {
             KclValue::Object { .. } => "object",
             KclValue::Module { .. } => "module",
             KclValue::KclNone { .. } => "None",
+            KclValue::Tombstone { .. } => "TOMBSTONE",
         }
     }
 
@@ -302,6 +314,16 @@ impl KclValue {
         }
     }
 
+    pub(crate) fn map_env_ref(&self, env_map: &HashMap<EnvironmentRef, EnvironmentRef>) -> Self {
+        let mut result = self.clone();
+        if let KclValue::Function { ref mut memory, .. } = result {
+            if let Some(new) = env_map.get(memory) {
+                *memory = *new;
+            }
+        }
+        result
+    }
+
     /// Put the number into a KCL value.
     pub const fn from_number(f: f64, meta: Vec<Metadata>) -> Self {
         Self::Number { value: f, meta }
@@ -406,6 +428,14 @@ impl KclValue {
         }
     }
 
+    pub fn as_sketch(&self) -> Option<&Sketch> {
+        if let KclValue::Sketch { value } = self {
+            Some(value)
+        } else {
+            None
+        }
+    }
+
     pub fn as_f64(&self) -> Option<f64> {
         if let KclValue::Number { value, meta: _ } = &self {
             Some(*value)
@@ -454,7 +484,7 @@ impl KclValue {
         Some(FnAsArg {
             func: func.as_ref(),
             expr: expression.to_owned(),
-            memory: memory.to_owned(),
+            memory: *memory,
         })
     }
 
@@ -518,24 +548,19 @@ impl KclValue {
         } = &self
         else {
             return Err(KclError::Semantic(KclErrorDetails {
-                message: "not a in memory function".to_string(),
+                message: "not an in-memory function".to_string(),
                 source_ranges: vec![],
             }));
         };
         if let Some(func) = func {
-            func(
-                args,
-                closure_memory.as_ref().clone(),
-                expression.clone(),
-                meta.clone(),
-                exec_state,
-                ctx,
-            )
-            .await
+            exec_state.mut_memory().push_new_env_for_call(*closure_memory);
+            let result = func(args, *closure_memory, expression.clone(), meta.clone(), exec_state, ctx).await;
+            exec_state.mut_memory().pop_env();
+            result
         } else {
             crate::execution::exec_ast::call_user_defined_function(
                 args,
-                closure_memory.as_ref(),
+                *closure_memory,
                 expression.as_ref(),
                 exec_state,
                 &ctx,
@@ -570,7 +595,7 @@ impl KclValue {
         } else {
             crate::execution::exec_ast::call_user_defined_function_kw(
                 args.kw_args,
-                closure_memory.as_ref(),
+                *closure_memory,
                 expression.as_ref(),
                 exec_state,
                 &ctx,

src/wasm-lib/kcl/src/execution/mod.rs

@@ -3,17 +3,8 @@
 use std::{path::PathBuf, sync::Arc};
 
 use anyhow::Result;
-pub use artifact::{Artifact, ArtifactCommand, ArtifactGraph, ArtifactId};
-pub use cache::bust_cache;
 use cache::OldAstState;
-pub use cad_op::Operation;
-pub use exec_ast::FunctionParam;
-pub use geometry::*;
-pub(crate) use import::{
-    import_foreign, send_to_engine as send_import_to_engine, PreImportedGeometry, ZOO_COORD_SYSTEM,
-};
 use indexmap::IndexMap;
-pub use kcl_value::{KclObjectFields, KclValue, UnitAngle, UnitLen};
 use kcmc::{
     each_cmd as mcmd,
     ok_response::{output::TakeSnapshot, OkModelingCmdResponse},
@@ -21,10 +12,8 @@ use kcmc::{
     ImageFormat, ModelingCmd,
 };
 use kittycad_modeling_cmds as kcmc;
-pub use memory::ProgramMemory;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
-pub use state::{ExecState, IdGenerator, MetaSettings};
 
 use crate::{
     engine::EngineManager,
@@ -41,6 +30,18 @@ use crate::{
     ExecError, KclErrorWithOutputs,
 };
 
+pub use artifact::{Artifact, ArtifactCommand, ArtifactGraph, ArtifactId};
+pub use cache::{bust_cache, clear_mem_cache};
+pub use cad_op::Operation;
+pub use exec_ast::FunctionParam;
+pub use geometry::*;
+pub(crate) use import::{
+    import_foreign, send_to_engine as send_import_to_engine, PreImportedGeometry, ZOO_COORD_SYSTEM,
+};
+pub use kcl_value::{KclObjectFields, KclValue, UnitAngle, UnitLen};
+pub use memory::{EnvironmentRef, ProgramMemory};
+pub use state::{ExecState, IdGenerator, MetaSettings};
+
 pub(crate) mod annotations;
 mod artifact;
 pub(crate) mod cache;
@@ -53,12 +54,12 @@ mod memory;
 mod state;
 
 /// Outcome of executing a program.  This is used in TS.
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS)]
+#[derive(Debug, Clone, Deserialize, Serialize, ts_rs::TS)]
 #[ts(export)]
 #[serde(rename_all = "camelCase")]
 pub struct ExecOutcome {
-    /// Program variable bindings of the top-level module.
-    pub memory: ProgramMemory,
+    /// Variables in the top-level of the root module. Note that functions will have an invalid env ref.
+    pub variables: IndexMap<String, KclValue>,
     /// Operations that have been performed in execution order, for display in
     /// the Feature Tree.
     pub operations: Vec<Operation>,
@@ -133,7 +134,7 @@ impl std::hash::Hash for TagIdentifier {
 pub type MemoryFunction =
     fn(
         s: Vec<Arg>,
-        memory: ProgramMemory,
+        memory: EnvironmentRef,
         expression: crate::parsing::ast::types::BoxNode<FunctionExpression>,
         metadata: Vec<Metadata>,
         exec_state: &ExecState,
@@ -160,7 +161,6 @@ pub struct TagEngineInfo {
 #[serde(rename_all = "camelCase")]
 pub enum BodyType {
     Root,
-    Sketch,
     Block,
 }
 
@@ -496,17 +496,56 @@ impl ExecutorContext {
     pub async fn run_mock(
         &self,
         program: crate::Program,
-        program_memory_override: Option<ProgramMemory>,
+        use_prev_memory: bool,
+        variables: IndexMap<String, KclValue>,
     ) -> Result<ExecOutcome, KclErrorWithOutputs> {
         assert!(self.is_mock());
 
         let mut exec_state = ExecState::new(&self.settings);
-        if let Some(program_memory_override) = program_memory_override {
-            exec_state.mod_local.memory = program_memory_override;
+        let mut mem = if use_prev_memory {
+            cache::read_old_memory()
+                .await
+                .unwrap_or_else(|| exec_state.memory().clone())
+        } else {
+            exec_state.memory().clone()
+        };
+
+        // Add any extra variables to memory
+        let mut to_restore = Vec::new();
+        for (k, v) in variables {
+            crate::log::log(format!("add var: {k}"));
+            to_restore.push((k.clone(), mem.get(&k, SourceRange::default()).ok().cloned()));
+            mem.add(k, v, SourceRange::synthetic())
+                .map_err(KclErrorWithOutputs::no_outputs)?;
         }
 
+        // Push a scope so that old variables can be overwritten (since we might be re-executing some
+        // part of the scene).
+        mem.push_new_env_for_scope();
+
+        *exec_state.mut_memory() = mem;
+
         self.inner_run(&program.ast, &mut exec_state).await?;
-        Ok(exec_state.to_wasm_outcome())
+
+        // Restore any temporary variables, then save any newly created variables back to
+        // memory in case another run wants to use them. Note this is just saved to the preserved
+        // memory, not to the exec_state which is not cached for mock execution.
+        let mut mem = exec_state.memory().clone();
+
+        let top = mem.pop_and_preserve_env();
+        for (k, v) in to_restore {
+            match v {
+                Some(v) => mem.insert_or_update(k, v),
+                None => mem.clear(k),
+            }
+        }
+        mem.squash_env(top);
+
+        cache::write_old_memory(mem).await;
+
+        let outcome = exec_state.to_mock_wasm_outcome();
+        crate::log::log(format!("return mock {:#?}", outcome.variables));
+        Ok(outcome)
     }
 
     pub async fn run_with_caching(&self, program: crate::Program) -> Result<ExecOutcome, KclErrorWithOutputs> {
@@ -516,7 +555,7 @@ impl ExecutorContext {
             ast: old_ast,
             exec_state: old_state,
             settings: old_settings,
-        }) = cache::read_old_ast_memory().await
+        }) = cache::read_old_ast().await
         {
             let old = CacheInformation {
                 ast: &old_ast,
@@ -595,7 +634,7 @@ impl ExecutorContext {
         result?;
 
         // Save this as the last successful execution to the cache.
-        cache::write_old_ast_memory(OldAstState {
+        cache::write_old_ast(OldAstState {
             ast: program,
             exec_state: exec_state.clone(),
             settings: self.settings.clone(),
@@ -661,6 +700,14 @@ impl ExecutorContext {
             )
         })?;
 
+        if !self.is_mock() {
+            cache::write_old_memory(exec_state.memory().clone()).await;
+        }
+
+        crate::log::log(format!(
+            "Post interpretation KCL memory stats: {:#?}",
+            exec_state.memory().stats
+        ));
         let session_data = self.engine.get_session_data();
         Ok(session_data)
     }
@@ -1588,12 +1635,7 @@ let w = f() + f()
         ctx.run_with_caching(old_program).await.unwrap();
 
         // Get the id_generator from the first execution.
-        let id_generator = cache::read_old_ast_memory()
-            .await
-            .unwrap()
-            .exec_state
-            .global
-            .id_generator;
+        let id_generator = cache::read_old_ast().await.unwrap().exec_state.global.id_generator;
 
         let code = r#"sketch001 = startSketchOn('XZ')
 |> startProfileAt([62.74, 206.13], %)
@@ -1614,12 +1656,7 @@ let w = f() + f()
         // Execute the program.
         ctx.run_with_caching(program).await.unwrap();
 
-        let new_id_generator = cache::read_old_ast_memory()
-            .await
-            .unwrap()
-            .exec_state
-            .global
-            .id_generator;
+        let new_id_generator = cache::read_old_ast().await.unwrap().exec_state.global.id_generator;
 
         assert_eq!(id_generator, new_id_generator);
     }

src/wasm-lib/kcl/src/execution/state.rs

@@ -9,7 +9,7 @@ use crate::{
     errors::{KclError, KclErrorDetails},
     execution::{
         annotations, kcl_value, Artifact, ArtifactCommand, ArtifactGraph, ArtifactId, ExecOutcome, ExecutorSettings,
-        KclValue, Operation, ProgramMemory, SolidLazyIds, UnitAngle, UnitLen,
+        KclValue, Operation, ProgramMemory, UnitAngle, UnitLen,
     },
     modules::{ModuleId, ModuleInfo, ModuleLoader, ModulePath, ModuleRepr},
     parsing::ast::types::NonCodeValue,
@@ -27,6 +27,8 @@ pub struct ExecState {
 #[derive(Debug, Clone, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct GlobalState {
+    /// Program variable bindings.
+    pub memory: ProgramMemory,
     /// The stable artifact ID generator.
     pub id_generator: IdGenerator,
     /// Map from source file absolute path to module ID.
@@ -50,13 +52,9 @@ pub struct GlobalState {
     pub mod_loader: ModuleLoader,
 }
 
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq)]
+#[derive(Debug, Clone, Deserialize, Serialize)]
 #[serde(rename_all = "camelCase")]
 pub struct ModuleState {
-    /// Program variable bindings.
-    pub memory: ProgramMemory,
-    /// Dynamic state that follows dynamic flow of the program.
-    pub dynamic_state: DynamicState,
     /// The current value of the pipe operator returned from the previous
     /// expression.  If we're not currently in a pipeline, this will be None.
     pub pipe_value: Option<KclValue>,
@@ -99,7 +97,11 @@ impl ExecState {
         // Fields are opt-in so that we don't accidentally leak private internal
         // state when we add more to ExecState.
         ExecOutcome {
-            memory: self.mod_local.memory,
+            variables: self
+                .memory()
+                .find_all_in_current_env(|_| true)
+                .map(|(k, v)| (k.clone(), v.clone()))
+                .collect(),
             operations: self.mod_local.operations,
             artifacts: self.global.artifacts,
             artifact_commands: self.global.artifact_commands,
@@ -107,12 +109,28 @@ impl ExecState {
         }
     }
 
+    pub fn to_mock_wasm_outcome(self) -> ExecOutcome {
+        // Fields are opt-in so that we don't accidentally leak private internal
+        // state when we add more to ExecState.
+        ExecOutcome {
+            variables: self
+                .memory()
+                .find_all_in_current_env(|_| true)
+                .map(|(k, v)| (k.clone(), v.clone()))
+                .collect(),
+            operations: Default::default(),
+            artifacts: Default::default(),
+            artifact_commands: Default::default(),
+            artifact_graph: Default::default(),
+        }
+    }
+
     pub fn memory(&self) -> &ProgramMemory {
-        &self.mod_local.memory
+        &self.global.memory
     }
 
     pub fn mut_memory(&mut self) -> &mut ProgramMemory {
-        &mut self.mod_local.memory
+        &mut self.global.memory
     }
 
     pub fn next_uuid(&mut self) -> Uuid {
@@ -148,11 +166,29 @@ impl ExecState {
     pub fn angle_unit(&self) -> UnitAngle {
         self.mod_local.settings.default_angle_units
     }
+
+    pub(super) fn circular_import_error(&self, path: &ModulePath, source_range: SourceRange) -> KclError {
+        KclError::ImportCycle(KclErrorDetails {
+            message: format!(
+                "circular import of modules is not allowed: {} -> {}",
+                self.global
+                    .mod_loader
+                    .import_stack
+                    .iter()
+                    .map(|p| p.as_path().to_string_lossy())
+                    .collect::<Vec<_>>()
+                    .join(" -> "),
+                path,
+            ),
+            source_ranges: vec![source_range],
+        })
+    }
 }
 
 impl GlobalState {
     fn new(settings: &ExecutorSettings) -> Self {
         let mut global = GlobalState {
+            memory: ProgramMemory::new(),
             id_generator: Default::default(),
             path_to_source_id: Default::default(),
             module_infos: Default::default(),
@@ -181,8 +217,6 @@ impl GlobalState {
 impl ModuleState {
     pub(super) fn new(exec_settings: &ExecutorSettings) -> Self {
         ModuleState {
-            memory: Default::default(),
-            dynamic_state: Default::default(),
             pipe_value: Default::default(),
             module_exports: Default::default(),
             operations: Default::default(),
@@ -239,46 +273,6 @@ impl MetaSettings {
     }
 }
 
-/// Dynamic state that depends on the dynamic flow of the program, like the call
-/// stack.  If the language had exceptions, for example, you could store the
-/// stack of exception handlers here.
-#[derive(Debug, Default, Clone, PartialEq, Eq, Deserialize, Serialize)]
-pub struct DynamicState {
-    pub solid_ids: Vec<SolidLazyIds>,
-}
-
-impl DynamicState {
-    #[must_use]
-    pub(super) fn merge(&self, memory: &ProgramMemory) -> Self {
-        let mut merged = self.clone();
-        merged.append(memory);
-        merged
-    }
-
-    fn append(&mut self, memory: &ProgramMemory) {
-        for env in &memory.environments {
-            for item in env.bindings.values() {
-                if let KclValue::Solid { value } = item {
-                    self.solid_ids.push(SolidLazyIds::from(value.as_ref()));
-                }
-            }
-        }
-    }
-
-    pub(crate) fn edge_cut_ids_on_sketch(&self, sketch_id: uuid::Uuid) -> Vec<uuid::Uuid> {
-        self.solid_ids
-            .iter()
-            .flat_map(|eg| {
-                if eg.sketch_id == sketch_id {
-                    eg.edge_cuts.clone()
-                } else {
-                    Vec::new()
-                }
-            })
-            .collect::<Vec<_>>()
-    }
-}
-
 /// A generator for ArtifactIds that can be stable across executions.
 #[derive(Debug, Clone, Default, Deserialize, Serialize, PartialEq)]
 #[serde(rename_all = "camelCase")]

src/wasm-lib/kcl/src/lib.rs

@@ -83,7 +83,9 @@ mod wasm;
 pub use coredump::CoreDump;
 pub use engine::{EngineManager, ExecutionKind};
 pub use errors::{CompilationError, ConnectionError, ExecError, KclError, KclErrorWithOutputs};
-pub use execution::{bust_cache, ExecOutcome, ExecState, ExecutorContext, ExecutorSettings, MetaSettings, Point2d};
+pub use execution::{
+    bust_cache, clear_mem_cache, ExecOutcome, ExecState, ExecutorContext, ExecutorSettings, MetaSettings, Point2d,
+};
 pub use lsp::{
     copilot::Backend as CopilotLspBackend,
     kcl::{Backend as KclLspBackend, Server as KclLspServerSubCommand},

src/wasm-lib/kcl/src/log.rs

@@ -102,7 +102,7 @@ impl<'a> LogPerfStats<'a> {
         }
     }
 
-    /// After `cancel`ing, this object will not log its stats on drop (you can still can `log_now`).
+    /// After `cancel`ing, this object will not log its stats on drop (you can still `log_now`).
     pub fn cancel(&mut self) {
         self.cancelled = true;
     }

src/wasm-lib/kcl/src/lsp/kcl/custom_notifications.rs

@@ -14,15 +14,6 @@ impl Notification for AstUpdated {
     const METHOD: &'static str = "kcl/astUpdated";
 }
 
-/// A notification that the Memory has changed.
-#[derive(Debug)]
-pub enum MemoryUpdated {}
-
-impl Notification for MemoryUpdated {
-    type Params = crate::execution::ProgramMemory;
-    const METHOD: &'static str = "kcl/memoryUpdated";
-}
-
 /// Text documents are identified using a URI. On the protocol level, URIs are passed as strings.
 #[derive(Debug, Eq, PartialEq, Clone, Deserialize, Serialize, ts_rs::TS)]
 #[serde(rename_all = "camelCase")]

src/wasm-lib/kcl/src/lsp/kcl/mod.rs

@@ -102,8 +102,6 @@ pub struct Backend {
     pub(super) token_map: DashMap<String, TokenStream>,
     /// AST maps.
     pub ast_map: DashMap<String, Node<crate::parsing::ast::types::Program>>,
-    /// Memory maps.
-    pub memory_map: DashMap<String, crate::execution::ProgramMemory>,
     /// Current code.
     pub code_map: DashMap<String, Vec<u8>>,
     /// Diagnostics.
@@ -181,7 +179,6 @@ impl Backend {
             workspace_folders: Default::default(),
             token_map: Default::default(),
             ast_map: Default::default(),
-            memory_map: Default::default(),
             code_map: Default::default(),
             diagnostics_map: Default::default(),
             symbols_map: Default::default(),
@@ -193,7 +190,6 @@ impl Backend {
     fn remove_from_ast_maps(&self, filename: &str) {
         self.ast_map.remove(filename);
         self.symbols_map.remove(filename);
-        self.memory_map.remove(filename);
     }
 }
 
@@ -279,13 +275,6 @@ impl crate::lsp::backend::Backend for Backend {
             }
         };
 
-        // Try to get the memory for the current code.
-        let has_memory = if let Some(memory) = self.memory_map.get(&filename) {
-            *memory != crate::execution::ProgramMemory::default()
-        } else {
-            false
-        };
-
         // Get the previous tokens.
         let tokens_changed = if let Some(previous_tokens) = self.token_map.get(&filename) {
             *previous_tokens != tokens
@@ -293,8 +282,10 @@ impl crate::lsp::backend::Backend for Backend {
             true
         };
 
+        let had_diagnostics = self.has_diagnostics(params.uri.as_ref()).await;
+
         // Check if the tokens are the same.
-        if !tokens_changed && !force && has_memory && !self.has_diagnostics(params.uri.as_ref()).await {
+        if !tokens_changed && !force && !had_diagnostics {
             // We return early here because the tokens are the same.
             return;
         }
@@ -343,7 +334,7 @@ impl crate::lsp::backend::Backend for Backend {
             None => true,
         };
 
-        if !ast_changed && !force && has_memory {
+        if !ast_changed && !force && !had_diagnostics {
             // Return early if the ast did not change and we don't need to force.
             return;
         }
@@ -680,24 +671,13 @@ impl Backend {
 
         match executor_ctx.run_with_caching(ast.clone()).await {
             Err(err) => {
-                self.memory_map.remove(params.uri.as_str());
                 self.add_to_diagnostics(params, &[err.error], false).await;
 
                 // Since we already published the diagnostics we don't really care about the error
                 // string.
                 Err(anyhow::anyhow!("failed to execute code"))
             }
-            Ok(outcome) => {
-                let memory = outcome.memory;
-                self.memory_map.insert(params.uri.to_string(), memory.clone());
-
-                // Send the notification to the client that the memory was updated.
-                self.client
-                    .send_notification::<custom_notifications::MemoryUpdated>(memory)
-                    .await;
-
-                Ok(())
-            }
+            Ok(_) => Ok(()),
         }
     }
 
@@ -815,8 +795,6 @@ impl Backend {
         &self,
         params: custom_notifications::UpdateUnitsParams,
     ) -> RpcResult<Option<custom_notifications::UpdateUnitsResponse>> {
-        let filename = params.text_document.uri.to_string();
-
         {
             let mut ctx = self.executor_ctx.write().await;
             // Borrow the executor context mutably.
@@ -831,16 +809,8 @@ impl Backend {
                 .log_message(MessageType::INFO, format!("update units: {:?}", params))
                 .await;
 
-            // Try to get the memory for the current code.
-            let has_memory = if let Some(memory) = self.memory_map.get(&filename) {
-                *memory != crate::execution::ProgramMemory::default()
-            } else {
-                false
-            };
-
             if executor_ctx.settings.units == params.units
                 && !self.has_diagnostics(params.text_document.uri.as_ref()).await
-                && has_memory
             {
                 // Return early the units are the same.
                 return Ok(None);

src/wasm-lib/kcl/src/lsp/test_util.rs

@@ -28,7 +28,6 @@ pub async fn kcl_lsp_server(execute: bool) -> Result<crate::lsp::kcl::Backend> {
         stdlib_signatures,
         token_map: Default::default(),
         ast_map: Default::default(),
-        memory_map: Default::default(),
         code_map: Default::default(),
         diagnostics_map: Default::default(),
         symbols_map: Default::default(),

src/wasm-lib/kcl/src/lsp/tests.rs

@@ -7,7 +7,6 @@ use tower_lsp::{
 };
 
 use crate::{
-    execution::ProgramMemory,
     lsp::test_util::{copilot_lsp_server, kcl_lsp_server},
     parsing::ast::types::{Node, Program},
 };
@@ -1543,13 +1542,13 @@ sphere = startSketchOn('XZ')
      }, %)
   |> close()
   |> revolve({ axis: 'x' }, %)
-  |> patternCircular3d({
-       axis: [0, 0, 1],
-       center: [0, 0, 0],
-       repetitions: 10,
-       arcDegrees: 360,
-       rotateDuplicates: true
-     }, %)
+  |> patternCircular3d(
+       axis = [0, 0, 1],
+       center = [0, 0, 0],
+       repetitions = 10,
+       arcDegrees = 360,
+       rotateDuplicates = true,
+     )
 
 // Sketch and revolve the outside bearing
 outsideRevolve = startSketchOn('XZ')
@@ -1644,13 +1643,13 @@ sphere = startSketchOn('XZ')
      }, %)
   |> close()
   |> revolve({ axis = 'x' }, %)
-  |> patternCircular3d({
+  |> patternCircular3d(
        axis = [0, 0, 1],
        center = [0, 0, 0],
        repetitions = 10,
        arcDegrees = 360,
-       rotateDuplicates = true
-     }, %)
+       rotateDuplicates = true,
+     )
 
 // Sketch and revolve the outside bearing
 outsideRevolve = startSketchOn('XZ')
@@ -2163,9 +2162,6 @@ async fn test_kcl_lsp_on_change_update_ast() {
         .await;
 
     assert!(ast != server.ast_map.get("file:///test.kcl").unwrap().clone());
-
-    // Make sure we never updated the memory since we aren't running the engine.
-    assert!(server.memory_map.get("file:///test.kcl").is_none());
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -2186,9 +2182,6 @@ async fn kcl_test_kcl_lsp_on_change_update_memory() {
         })
         .await;
 
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-
     // Send change file.
     server
         .did_change(tower_lsp::lsp_types::DidChangeTextDocumentParams {
@@ -2204,9 +2197,6 @@ async fn kcl_test_kcl_lsp_on_change_update_memory() {
         })
         .await;
 
-    // Make sure the memory is the same.
-    assert_eq!(memory, server.memory_map.get("file:///test.kcl").unwrap().clone());
-
     // Update the text.
     let new_text = r#"thing = 2"#.to_string();
     // Send change file.
@@ -2223,8 +2213,6 @@ async fn kcl_test_kcl_lsp_on_change_update_memory() {
             }],
         })
         .await;
-
-    assert!(memory != server.memory_map.get("file:///test.kcl").unwrap().clone());
 }
 
 #[tokio::test(flavor = "multi_thread", worker_threads = 10)]
@@ -2265,9 +2253,6 @@ part001 = cube([0,0], 20)
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert_eq!(ast.body.len(), 2);
 
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-
     // Send change file.
     server
         .did_change(tower_lsp::lsp_types::DidChangeTextDocumentParams {
@@ -2283,9 +2268,6 @@ part001 = cube([0,0], 20)
         })
         .await;
 
-    // Make sure the memory is the same.
-    assert_eq!(memory, server.memory_map.get("file:///test.kcl").unwrap().clone());
-
     let units = server.executor_ctx.read().await.clone().unwrap().settings.units;
     assert_eq!(units, crate::settings::types::UnitLength::Mm);
 
@@ -2303,9 +2285,6 @@ part001 = cube([0,0], 20)
 
     let units = server.executor_ctx().await.clone().unwrap().settings.units;
     assert_eq!(units, crate::settings::types::UnitLength::M);
-
-    // Make sure it forced a memory update.
-    assert!(memory != server.memory_map.get("file:///test.kcl").unwrap().clone());
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -2323,10 +2302,6 @@ async fn kcl_test_kcl_lsp_empty_file_execute_ok() {
             },
         })
         .await;
-
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert_eq!(memory, ProgramMemory::default());
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -2454,9 +2429,6 @@ async fn kcl_test_kcl_lsp_full_to_empty_file_updates_ast_and_memory() {
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Send change file.
     server
@@ -2479,9 +2451,6 @@ async fn kcl_test_kcl_lsp_full_to_empty_file_updates_ast_and_memory() {
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert_eq!(ast, default_hashed);
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert_eq!(memory, ProgramMemory::default());
 }
 
 #[tokio::test(flavor = "multi_thread")]
@@ -2511,9 +2480,6 @@ async fn kcl_test_kcl_lsp_code_unchanged_but_has_diagnostics_reexecute() {
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
@@ -2545,11 +2511,6 @@ async fn kcl_test_kcl_lsp_code_unchanged_but_has_diagnostics_reexecute() {
         .insert("file:///test.kcl".to_string(), Node::<Program>::default());
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert_eq!(ast, Node::<Program>::default());
-    server
-        .memory_map
-        .insert("file:///test.kcl".to_string(), ProgramMemory::default());
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert_eq!(memory, ProgramMemory::default());
 
     // Send change file, but the code is the same.
     server
@@ -2569,9 +2530,6 @@ async fn kcl_test_kcl_lsp_code_unchanged_but_has_diagnostics_reexecute() {
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
@@ -2604,9 +2562,6 @@ async fn kcl_test_kcl_lsp_code_and_ast_unchanged_but_has_diagnostics_reexecute()
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
@@ -2632,13 +2587,6 @@ async fn kcl_test_kcl_lsp_code_and_ast_unchanged_but_has_diagnostics_reexecute()
     // Assure we have one diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 1);
 
-    // Clear ONLY the memory.
-    server
-        .memory_map
-        .insert("file:///test.kcl".to_string(), ProgramMemory::default());
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert_eq!(memory, ProgramMemory::default());
-
     // Send change file, but the code is the same.
     server
         .did_change(tower_lsp::lsp_types::DidChangeTextDocumentParams {
@@ -2657,9 +2605,6 @@ async fn kcl_test_kcl_lsp_code_and_ast_unchanged_but_has_diagnostics_reexecute()
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
@@ -2692,9 +2637,6 @@ async fn kcl_test_kcl_lsp_code_and_ast_units_unchanged_but_has_diagnostics_reexe
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
@@ -2720,13 +2662,6 @@ async fn kcl_test_kcl_lsp_code_and_ast_units_unchanged_but_has_diagnostics_reexe
     // Assure we have one diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 1);
 
-    // Clear ONLY the memory.
-    server
-        .memory_map
-        .insert("file:///test.kcl".to_string(), ProgramMemory::default());
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert_eq!(memory, ProgramMemory::default());
-
     let units = server.executor_ctx().await.clone().unwrap().settings.units;
     assert_eq!(units, crate::settings::types::UnitLength::Mm);
 
@@ -2748,9 +2683,6 @@ async fn kcl_test_kcl_lsp_code_and_ast_units_unchanged_but_has_diagnostics_reexe
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
@@ -2783,20 +2715,10 @@ async fn kcl_test_kcl_lsp_code_and_ast_units_unchanged_but_has_memory_reexecute_
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
 
-    // Clear ONLY the memory.
-    server
-        .memory_map
-        .insert("file:///test.kcl".to_string(), ProgramMemory::default());
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert_eq!(memory, ProgramMemory::default());
-
     let units = server.executor_ctx().await.clone().unwrap().settings.units;
     assert_eq!(units, crate::settings::types::UnitLength::Mm);
 
@@ -2818,9 +2740,6 @@ async fn kcl_test_kcl_lsp_code_and_ast_units_unchanged_but_has_memory_reexecute_
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
@@ -2853,20 +2772,10 @@ async fn kcl_test_kcl_lsp_cant_execute_set() {
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
 
-    // Clear ONLY the memory.
-    server
-        .memory_map
-        .insert("file:///test.kcl".to_string(), ProgramMemory::default());
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert_eq!(memory, ProgramMemory::default());
-
     // Update the units to the _same_ units.
     let units = server.executor_ctx().await.clone().unwrap().settings.units;
     assert_eq!(units, crate::settings::types::UnitLength::Mm);
@@ -2887,20 +2796,10 @@ async fn kcl_test_kcl_lsp_cant_execute_set() {
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
 
-    // Clear ONLY the memory.
-    server
-        .memory_map
-        .insert("file:///test.kcl".to_string(), ProgramMemory::default());
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert_eq!(memory, ProgramMemory::default());
-
     assert_eq!(server.can_execute().await, true);
 
     // Set that we cannot execute.
@@ -2933,10 +2832,6 @@ async fn kcl_test_kcl_lsp_cant_execute_set() {
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != default_hashed);
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    // Now it should be the default memory.
-    assert!(memory == ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
@@ -2968,10 +2863,6 @@ async fn kcl_test_kcl_lsp_cant_execute_set() {
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    // Now it should NOT be the default memory.
-    assert!(memory != ProgramMemory::default());
 
     // Assure we have no diagnostics.
     assert_diagnostic_count(server.diagnostics_map.get("file:///test.kcl").as_deref(), 0);
@@ -3219,9 +3110,6 @@ part001 = startSketchOn('XY')
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl");
-    assert!(memory.is_none());
 
     // Send change file, but the code is the same.
     server
@@ -3241,9 +3129,6 @@ part001 = startSketchOn('XY')
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl");
-    assert!(memory.is_none());
 
     // Assure we have diagnostics.
 
@@ -3284,9 +3169,6 @@ part001 = startSketchOn('XY')
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl");
-    assert!(memory.is_none());
 
     // Send change file, but the code is the same.
     server
@@ -3314,9 +3196,6 @@ NEW_LINT = 1"#
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl").unwrap().clone();
     assert!(ast != Node::<Program>::default());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl");
-    assert!(memory.is_none());
 
     // Assure we have diagnostics.
 
@@ -3357,9 +3236,6 @@ part001 = startSketchOn('XY')
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl");
     assert!(ast.is_none());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl");
-    assert!(memory.is_none());
 
     // Send change file, but the code is the same.
     server
@@ -3387,9 +3263,6 @@ NEW_LINT = 1"#
     // Get the ast.
     let ast = server.ast_map.get("file:///test.kcl");
     assert!(ast.is_none());
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl");
-    assert!(memory.is_none());
 
     // Assure we have diagnostics.
 
@@ -3439,10 +3312,6 @@ part001 = startSketchOn('XY')
     let semantic_tokens_map = server.semantic_tokens_map.get("file:///test.kcl").unwrap().clone();
     assert!(!semantic_tokens_map.is_empty());
 
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
-
     // Send change file, but the code is the same.
     server
         .did_change(tower_lsp::lsp_types::DidChangeTextDocumentParams {
@@ -3478,10 +3347,6 @@ NEW_LINT = 1"#
     let semantic_tokens_map = server.semantic_tokens_map.get("file:///test.kcl").unwrap().clone();
     assert!(!semantic_tokens_map.is_empty());
 
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl");
-    assert!(memory.is_none());
-
     // Assure we have diagnostics.
 
     // Check the diagnostics.
@@ -3534,10 +3399,6 @@ part001 = startSketchOn('XY')
     let semantic_tokens_map = server.semantic_tokens_map.get("file:///test.kcl").unwrap().clone();
     assert!(!semantic_tokens_map.is_empty());
 
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl").unwrap().clone();
-    assert!(memory != ProgramMemory::default());
-
     // Send change file, but the code is the same.
     server
         .did_change(tower_lsp::lsp_types::DidChangeTextDocumentParams {
@@ -3577,10 +3438,6 @@ part001 = startSketchOn('XY')
     let semantic_tokens_map = server.semantic_tokens_map.get("file:///test.kcl").unwrap().clone();
     assert!(!semantic_tokens_map.is_empty());
 
-    // Get the memory.
-    let memory = server.memory_map.get("file:///test.kcl");
-    assert!(memory.is_none());
-
     // Assure we have diagnostics.
 
     // Check the diagnostics.

src/wasm-lib/kcl/src/modules.rs

@@ -6,7 +6,7 @@ use serde::{Deserialize, Serialize};
 
 use crate::{
     errors::{KclError, KclErrorDetails},
-    execution::PreImportedGeometry,
+    execution::{EnvironmentRef, PreImportedGeometry},
     fs::{FileManager, FileSystem},
     parsing::ast::types::{ImportPath, Node, Program},
     source_range::SourceRange,
@@ -78,8 +78,7 @@ pub(crate) fn read_std(_mod_name: &str) -> Option<&'static str> {
     None
 }
 
-/// Info about a module.  Right now, this is pretty minimal.  We hope to cache
-/// modules here in the future.
+/// Info about a module.
 #[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
 pub struct ModuleInfo {
     /// The ID of the module.
@@ -89,12 +88,27 @@ pub struct ModuleInfo {
     pub(crate) repr: ModuleRepr,
 }
 
+impl ModuleInfo {
+    pub(crate) fn take_repr(&mut self) -> ModuleRepr {
+        let mut result = ModuleRepr::Dummy;
+        std::mem::swap(&mut self.repr, &mut result);
+        result
+    }
+
+    pub(crate) fn restore_repr(&mut self, repr: ModuleRepr) {
+        assert!(matches!(&self.repr, ModuleRepr::Dummy));
+        self.repr = repr;
+    }
+}
+
 #[allow(clippy::large_enum_variant)]
 #[derive(Debug, Clone, PartialEq, Deserialize, Serialize)]
 pub enum ModuleRepr {
     Root,
-    Kcl(Node<Program>),
+    // AST, memory, exported names
+    Kcl(Node<Program>, Option<(EnvironmentRef, Vec<String>)>),
     Foreign(PreImportedGeometry),
+    Dummy,
 }
 
 #[allow(clippy::large_enum_variant)]

src/wasm-lib/kcl/src/parsing/ast/types/mod.rs

@@ -3232,6 +3232,21 @@ impl FunctionExpression {
 
         None
     }
+
+    #[cfg(test)]
+    pub fn dummy() -> Box<Node<Self>> {
+        Box::new(Node::new(
+            FunctionExpression {
+                params: Vec::new(),
+                body: Node::new(Program::default(), 0, 0, ModuleId::default()),
+                return_type: None,
+                digest: None,
+            },
+            0,
+            0,
+            ModuleId::default(),
+        ))
+    }
 }
 
 #[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]

src/wasm-lib/kcl/src/simulation_tests.rs

@@ -103,7 +103,7 @@ async fn execute(test_name: &str, render_to_png: bool) {
                 twenty_twenty::assert_image(format!("tests/{test_name}/rendered_model.png"), &png, 0.99);
             }
             assert_snapshot(test_name, "Program memory after executing", || {
-                insta::assert_json_snapshot!("program_memory", exec_state.mod_local.memory, {
+                insta::assert_json_snapshot!("program_memory", exec_state.memory(), {
                     ".environments[].**[].from[]" => rounded_redaction(4),
                     ".environments[].**[].to[]" => rounded_redaction(4),
                     ".environments[].**[].x[]" => rounded_redaction(4),
@@ -187,14 +187,6 @@ fn assert_common_snapshots(
         // in GitHub.
         insta::assert_binary_snapshot!("artifact_graph_flowchart.md", flowchart.as_bytes().to_owned());
     });
-    assert_snapshot(test_name, "Artifact graph mind map", || {
-        let mind_map = artifact_graph
-            .to_mermaid_mind_map()
-            .unwrap_or_else(|e| format!("Failed to convert artifact graph to mind map: {e}"));
-        // Change the snapshot suffix so that it is rendered as a Markdown file
-        // in GitHub.
-        insta::assert_binary_snapshot!("artifact_graph_mind_map.md", mind_map.as_bytes().to_owned());
-    });
 }
 
 mod cube {

src/wasm-lib/kcl/src/std/appearance.rs

@@ -181,11 +181,11 @@ pub async fn appearance(_exec_state: &mut ExecState, args: Args) -> Result<KclVa
 ///         metalness = 90,
 ///         roughness = 90
 ///        )
-///   |> patternLinear3d({
+///     |> patternLinear3d(
 ///         axis = [1, 0, 1],
 ///         instances = 7,
 ///         distance = 6
-///     }, %)
+///        )
 /// ```
 ///
 /// ```no_run
@@ -199,11 +199,11 @@ pub async fn appearance(_exec_state: &mut ExecState, args: Args) -> Result<KclVa
 ///   |> close()
 ///
 /// example = extrude(exampleSketch, length = 1)
-///   |> patternLinear3d({
+///   |> patternLinear3d(
 ///       axis = [1, 0, 1],
 ///       instances = 7,
 ///       distance = 6
-///     }, %)
+///      )
 ///   |> appearance(
 ///       color = '#ff0000',
 ///       metalness = 90,
@@ -219,12 +219,12 @@ pub async fn appearance(_exec_state: &mut ExecState, args: Args) -> Result<KclVa
 ///   |> line(end = [-1, 0])
 ///   |> line(end = [0, -5])
 ///   |> close()
-///   |> patternCircular2d({
+///   |> patternCircular2d(
 ///        center = [0, 0],
 ///        instances = 13,
 ///        arcDegrees = 360,
 ///        rotateDuplicates = true
-///      }, %)
+///      )
 ///
 /// example = extrude(exampleSketch, length = 1)
 ///     |> appearance(

src/wasm-lib/kcl/src/std/args.rs

@@ -188,7 +188,7 @@ impl Args {
         exec_state: &'e mut ExecState,
         tag: &'a TagIdentifier,
     ) -> Result<&'e crate::execution::TagEngineInfo, KclError> {
-        if let KclValue::TagIdentifier(t) = exec_state.memory().get(&tag.value, self.source_range)? {
+        if let KclValue::TagIdentifier(t) = exec_state.memory().get_from_call_stack(&tag.value, self.source_range)? {
             Ok(t.info.as_ref().ok_or_else(|| {
                 KclError::Type(KclErrorDetails {
                     message: format!("Tag `{}` does not have engine info", tag.value),
@@ -255,11 +255,13 @@ impl Args {
                 ids.extend(
                     exec_state
                         .memory()
-                        .find_solids_on_sketch(solid.sketch.id)
-                        .iter()
-                        .flat_map(|eg| eg.get_all_edge_cut_ids()),
+                        .walk_call_stack()
+                        .filter(|v| matches!(v, KclValue::Solid { value } if value.sketch.id == sketch_id))
+                        .flat_map(|v| match v {
+                            KclValue::Solid { value } => value.get_all_edge_cut_ids(),
+                            _ => unreachable!(),
+                        }),
                 );
-                ids.extend(exec_state.mod_local.dynamic_state.edge_cut_ids_on_sketch(sketch_id));
                 traversed_sketches.push(sketch_id);
             }
 
@@ -440,13 +442,6 @@ impl Args {
         FromArgs::from_args(self, 0)
     }
 
-    pub(crate) fn get_data_and_solid_set<'a, T>(&'a self) -> Result<(T, SolidSet), KclError>
-    where
-        T: serde::de::DeserializeOwned + FromKclValue<'a> + Sized,
-    {
-        FromArgs::from_args(self, 0)
-    }
-
     pub(crate) fn get_data_and_solid<'a, T>(&'a self) -> Result<(T, Box<Solid>), KclError>
     where
         T: serde::de::DeserializeOwned + FromKclValue<'a> + Sized,
@@ -943,72 +938,6 @@ impl<'a> FromKclValue<'a> for kittycad_modeling_cmds::coord::Direction {
     }
 }
 
-impl<'a> FromKclValue<'a> for super::patterns::CircularPattern3dData {
-    fn from_kcl_val(arg: &'a KclValue) -> Option<Self> {
-        let obj = arg.as_object()?;
-        let_field_of!(obj, instances);
-        let_field_of!(obj, arc_degrees "arcDegrees");
-        let_field_of!(obj, rotate_duplicates "rotateDuplicates");
-        let_field_of!(obj, axis);
-        let_field_of!(obj, center);
-        let_field_of!(obj, use_original? "useOriginal");
-        Some(Self {
-            instances,
-            axis,
-            center,
-            arc_degrees,
-            rotate_duplicates,
-            use_original,
-        })
-    }
-}
-
-impl<'a> FromKclValue<'a> for super::patterns::CircularPattern2dData {
-    fn from_kcl_val(arg: &'a KclValue) -> Option<Self> {
-        let obj = arg.as_object()?;
-        let_field_of!(obj, instances);
-        let_field_of!(obj, arc_degrees "arcDegrees");
-        let_field_of!(obj, rotate_duplicates "rotateDuplicates");
-        let_field_of!(obj, center);
-        let_field_of!(obj, use_original? "useOriginal");
-        Some(Self {
-            instances,
-            center,
-            arc_degrees,
-            rotate_duplicates,
-            use_original,
-        })
-    }
-}
-
-impl<'a> FromKclValue<'a> for super::patterns::LinearPattern3dData {
-    fn from_kcl_val(arg: &'a KclValue) -> Option<Self> {
-        let obj = arg.as_object()?;
-        let_field_of!(obj, distance);
-        let_field_of!(obj, instances);
-        let_field_of!(obj, axis);
-        Some(Self {
-            instances,
-            distance,
-            axis,
-        })
-    }
-}
-
-impl<'a> FromKclValue<'a> for super::patterns::LinearPattern2dData {
-    fn from_kcl_val(arg: &'a KclValue) -> Option<Self> {
-        let obj = arg.as_object()?;
-        let_field_of!(obj, distance);
-        let_field_of!(obj, instances);
-        let_field_of!(obj, axis);
-        Some(Self {
-            instances,
-            distance,
-            axis,
-        })
-    }
-}
-
 impl<'a> FromKclValue<'a> for super::sketch::BezierData {
     fn from_kcl_val(arg: &'a KclValue) -> Option<Self> {
         let obj = arg.as_object()?;

src/wasm-lib/kcl/src/std/array.rs

@@ -19,7 +19,7 @@ pub async fn map(exec_state: &mut ExecState, args: Args) -> Result<KclValue, Kcl
         fn_expr: f.expr,
         meta: meta.clone(),
         ctx: args.ctx.clone(),
-        memory: *f.memory,
+        memory: f.memory,
     };
     let new_array = inner_map(array, map_fn, exec_state, &args).await?;
     Ok(KclValue::Array { value: new_array, meta })
@@ -97,7 +97,7 @@ pub async fn reduce(exec_state: &mut ExecState, args: Args) -> Result<KclValue,
         fn_expr: f.expr,
         meta: vec![args.source_range.into()],
         ctx: args.ctx.clone(),
-        memory: *f.memory,
+        memory: f.memory,
     };
     inner_reduce(array, start, reduce_fn, exec_state, &args).await
 }

src/wasm-lib/kcl/src/std/mod.rs

@@ -39,7 +39,7 @@ use serde::{Deserialize, Serialize};
 use crate::{
     docs::StdLibFn,
     errors::KclError,
-    execution::{ExecState, KclValue, ProgramMemory},
+    execution::{EnvironmentRef, ExecState, KclValue},
     parsing::ast::types::FunctionExpression,
 };
 
@@ -305,5 +305,5 @@ pub enum Primitive {
 pub struct FnAsArg<'a> {
     pub func: Option<&'a crate::execution::MemoryFunction>,
     pub expr: crate::parsing::ast::types::BoxNode<FunctionExpression>,
-    pub memory: Box<ProgramMemory>,
+    pub memory: EnvironmentRef,
 }

src/wasm-lib/kcl/src/std/patterns.rs

@@ -29,22 +29,6 @@ use crate::{
 
 const MUST_HAVE_ONE_INSTANCE: &str = "There must be at least 1 instance of your geometry";
 
-/// Data for a linear pattern on a 2D sketch.
-#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
-#[ts(export)]
-#[serde(rename_all = "camelCase")]
-pub struct LinearPattern2dData {
-    /// The number of total instances. Must be greater than or equal to 1.
-    /// This includes the original entity. For example, if instances is 2,
-    /// there will be two copies -- the original, and one new copy.
-    /// If instances is 1, this has no effect.
-    pub instances: u32,
-    /// The distance between each repetition. This can also be referred to as spacing.
-    pub distance: f64,
-    /// The axis of the pattern. This is a 2D vector.
-    pub axis: [f64; 2],
-}
-
 /// Data for a linear pattern on a 3D model.
 #[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
 #[ts(export)]
@@ -72,7 +56,7 @@ pub async fn pattern_transform(exec_state: &mut ExecState, args: Args) -> Result
             fn_expr: transform.expr,
             meta: vec![args.source_range.into()],
             ctx: args.ctx.clone(),
-            memory: *transform.memory,
+            memory: transform.memory,
         },
         extr,
         use_original,
@@ -95,7 +79,7 @@ pub async fn pattern_transform_2d(exec_state: &mut ExecState, args: Args) -> Res
             fn_expr: transform.expr,
             meta: vec![args.source_range.into()],
             ctx: args.ctx.clone(),
-            memory: *transform.memory,
+            memory: transform.memory,
         },
         sketch,
         use_original,
@@ -689,10 +673,13 @@ mod tests {
 
 /// A linear pattern on a 2D sketch.
 pub async fn pattern_linear_2d(exec_state: &mut ExecState, args: Args) -> Result<KclValue, KclError> {
-    let (data, sketch_set, use_original): (LinearPattern2dData, SketchSet, Option<bool>) =
-        super::args::FromArgs::from_args(&args, 0)?;
+    let sketch_set: SketchSet = args.get_unlabeled_kw_arg("sketchSet")?;
+    let instances: u32 = args.get_kw_arg("instances")?;
+    let distance: f64 = args.get_kw_arg("distance")?;
+    let axis: [f64; 2] = args.get_kw_arg("axis")?;
+    let use_original: Option<bool> = args.get_kw_arg_opt("useOriginal")?;
 
-    if data.axis == [0.0, 0.0] {
+    if axis == [0.0, 0.0] {
         return Err(KclError::Semantic(KclErrorDetails {
             message:
                 "The axis of the linear pattern cannot be the zero vector. Otherwise they will just duplicate in place."
@@ -701,7 +688,8 @@ pub async fn pattern_linear_2d(exec_state: &mut ExecState, args: Args) -> Result
         }));
     }
 
-    let sketches = inner_pattern_linear_2d(data, sketch_set, use_original, exec_state, args).await?;
+    let sketches =
+        inner_pattern_linear_2d(sketch_set, instances, distance, axis, use_original, exec_state, args).await?;
     Ok(sketches.into())
 }
 
@@ -711,31 +699,41 @@ pub async fn pattern_linear_2d(exec_state: &mut ExecState, args: Args) -> Result
 /// ```no_run
 /// exampleSketch = startSketchOn('XZ')
 ///   |> circle({ center = [0, 0], radius = 1 }, %)
-///   |> patternLinear2d({
+///   |> patternLinear2d(
 ///        axis = [1, 0],
 ///        instances = 7,
 ///        distance = 4
-///      }, %)
+///      )
 ///
 /// example = extrude(exampleSketch, length = 1)
 /// ```
 #[stdlib {
     name = "patternLinear2d",
+    keywords = true,
+    unlabeled_first = true,
+    args = {
+        sketch_set = { docs = "The sketch(es) to duplicate" },
+        instances = { docs = "The number of total instances. Must be greater than or equal to 1. This includes the original entity. For example, if instances is 2, there will be two copies -- the original, and one new copy. If instances is 1, this has no effect." },
+        distance = { docs = "Distance between each repetition. Also known as 'spacing'."},
+        axis = { docs = "The axis of the pattern. A 2D vector." },
+        use_original = { docs = "If the target was sketched on an extrusion, setting this will use the original sketch as the target, not the entire joined solid. Defaults to false." },
+    }
 }]
 async fn inner_pattern_linear_2d(
-    data: LinearPattern2dData,
     sketch_set: SketchSet,
+    instances: u32,
+    distance: f64,
+    axis: [f64; 2],
     use_original: Option<bool>,
     exec_state: &mut ExecState,
     args: Args,
 ) -> Result<Vec<Box<Sketch>>, KclError> {
-    let axis = data.axis;
     let [x, y] = axis;
     let axis_len = f64::sqrt(x * x + y * y);
     let normalized_axis = kcmc::shared::Point2d::from([x / axis_len, y / axis_len]);
-    let transforms: Vec<_> = (1..data.instances)
+    let transforms: Vec<_> = (1..instances)
         .map(|i| {
-            let d = data.distance * (i as f64);
+            let d = distance * (i as f64);
             let translate = (normalized_axis * d).with_z(0.0).map(LengthUnit);
             vec![Transform {
                 translate,
@@ -755,10 +753,13 @@ async fn inner_pattern_linear_2d(
 
 /// A linear pattern on a 3D model.
 pub async fn pattern_linear_3d(exec_state: &mut ExecState, args: Args) -> Result<KclValue, KclError> {
-    let (data, solid_set, use_original): (LinearPattern3dData, SolidSet, Option<bool>) =
-        super::args::FromArgs::from_args(&args, 0)?;
+    let solid_set: SolidSet = args.get_unlabeled_kw_arg("solidSet")?;
+    let instances: u32 = args.get_kw_arg("instances")?;
+    let distance: f64 = args.get_kw_arg("distance")?;
+    let axis: [f64; 3] = args.get_kw_arg("axis")?;
+    let use_original: Option<bool> = args.get_kw_arg_opt("useOriginal")?;
 
-    if data.axis == [0.0, 0.0, 0.0] {
+    if axis == [0.0, 0.0, 0.0] {
         return Err(KclError::Semantic(KclErrorDetails {
             message:
                 "The axis of the linear pattern cannot be the zero vector. Otherwise they will just duplicate in place."
@@ -767,7 +768,7 @@ pub async fn pattern_linear_3d(exec_state: &mut ExecState, args: Args) -> Result
         }));
     }
 
-    let solids = inner_pattern_linear_3d(data, solid_set, use_original, exec_state, args).await?;
+    let solids = inner_pattern_linear_3d(solid_set, instances, distance, axis, use_original, exec_state, args).await?;
     Ok(solids.into())
 }
 
@@ -783,30 +784,40 @@ pub async fn pattern_linear_3d(exec_state: &mut ExecState, args: Args) -> Result
 ///   |> close()
 ///
 /// example = extrude(exampleSketch, length = 1)
-///   |> patternLinear3d({
+///   |> patternLinear3d(
 ///       axis = [1, 0, 1],
 ///       instances = 7,
 ///       distance = 6
-///     }, %)
+///     )
 /// ```
 #[stdlib {
     name = "patternLinear3d",
     feature_tree_operation = true,
+    keywords = true,
+    unlabeled_first = true,
+    args = {
+        solid_set = { docs = "The solid(s) to duplicate" },
+        instances = { docs = "The number of total instances. Must be greater than or equal to 1. This includes the original entity. For example, if instances is 2, there will be two copies -- the original, and one new copy. If instances is 1, this has no effect." },
+        distance = { docs = "Distance between each repetition. Also known as 'spacing'."},
+        axis = { docs = "The axis of the pattern. A 2D vector." },
+        use_original = { docs = "If the target was sketched on an extrusion, setting this will use the original sketch as the target, not the entire joined solid. Defaults to false." },
+    }
 }]
 async fn inner_pattern_linear_3d(
-    data: LinearPattern3dData,
     solid_set: SolidSet,
+    instances: u32,
+    distance: f64,
+    axis: [f64; 3],
     use_original: Option<bool>,
     exec_state: &mut ExecState,
     args: Args,
 ) -> Result<Vec<Box<Solid>>, KclError> {
-    let axis = data.axis;
     let [x, y, z] = axis;
     let axis_len = f64::sqrt(x * x + y * y + z * z);
     let normalized_axis = kcmc::shared::Point3d::from([x / axis_len, y / axis_len, z / axis_len]);
-    let transforms: Vec<_> = (1..data.instances)
+    let transforms: Vec<_> = (1..instances)
         .map(|i| {
-            let d = data.distance * (i as f64);
+            let d = distance * (i as f64);
             let translate = (normalized_axis * d).map(LengthUnit);
             vec![Transform {
                 translate,
@@ -828,7 +839,7 @@ async fn inner_pattern_linear_3d(
 #[derive(Debug, Clone, Deserialize, Serialize, PartialEq, ts_rs::TS, JsonSchema)]
 #[ts(export)]
 #[serde(rename_all = "camelCase")]
-pub struct CircularPattern2dData {
+struct CircularPattern2dData {
     /// The number of total instances. Must be greater than or equal to 1.
     /// This includes the original entity. For example, if instances is 2,
     /// there will be two copies -- the original, and one new copy.
@@ -870,7 +881,7 @@ pub struct CircularPattern3dData {
     pub use_original: Option<bool>,
 }
 
-pub enum CircularPattern {
+enum CircularPattern {
     ThreeD(CircularPattern3dData),
     TwoD(CircularPattern2dData),
 }
@@ -941,9 +952,24 @@ impl CircularPattern {
 
 /// A circular pattern on a 2D sketch.
 pub async fn pattern_circular_2d(exec_state: &mut ExecState, args: Args) -> Result<KclValue, KclError> {
-    let (data, sketch_set): (CircularPattern2dData, SketchSet) = args.get_data_and_sketch_set()?;
+    let sketch_set: SketchSet = args.get_unlabeled_kw_arg("sketchSet")?;
+    let instances: u32 = args.get_kw_arg("instances")?;
+    let center: [f64; 2] = args.get_kw_arg("center")?;
+    let arc_degrees: f64 = args.get_kw_arg("arcDegrees")?;
+    let rotate_duplicates: bool = args.get_kw_arg("rotateDuplicates")?;
+    let use_original: Option<bool> = args.get_kw_arg_opt("useOriginal")?;
 
-    let sketches = inner_pattern_circular_2d(data, sketch_set, exec_state, args).await?;
+    let sketches = inner_pattern_circular_2d(
+        sketch_set,
+        instances,
+        center,
+        arc_degrees,
+        rotate_duplicates,
+        use_original,
+        exec_state,
+        args,
+    )
+    .await?;
     Ok(sketches.into())
 }
 
@@ -959,21 +985,36 @@ pub async fn pattern_circular_2d(exec_state: &mut ExecState, args: Args) -> Resu
 ///   |> line(end = [-1, 0])
 ///   |> line(end = [0, -5])
 ///   |> close()
-///   |> patternCircular2d({
+///   |> patternCircular2d(
 ///        center = [0, 0],
 ///        instances = 13,
 ///        arcDegrees = 360,
 ///        rotateDuplicates = true
-///      }, %)
+///      )
 ///
 /// example = extrude(exampleSketch, length = 1)
 /// ```
 #[stdlib {
     name = "patternCircular2d",
+    keywords = true,
+    unlabeled_first = true,
+    args = {
+        sketch_set = { docs = "Which sketch(es) to pattern" },
+        instances = { docs = "The number of total instances. Must be greater than or equal to 1. This includes the original entity. For example, if instances is 2, there will be two copies -- the original, and one new copy. If instances is 1, this has no effect."},
+        center = { docs = "The center about which to make the pattern. This is a 2D vector."},
+        arc_degrees = { docs = "The arc angle (in degrees) to place the repetitions. Must be greater than 0."},
+        rotate_duplicates= { docs = "Whether or not to rotate the duplicates as they are copied."},
+        use_original= { docs = "If the target was sketched on an extrusion, setting this will use the original sketch as the target, not the entire joined solid. Defaults to false."},
+    }
 }]
+#[allow(clippy::too_many_arguments)]
 async fn inner_pattern_circular_2d(
-    data: CircularPattern2dData,
     sketch_set: SketchSet,
+    instances: u32,
+    center: [f64; 2],
+    arc_degrees: f64,
+    rotate_duplicates: bool,
+    use_original: Option<bool>,
     exec_state: &mut ExecState,
     args: Args,
 ) -> Result<Vec<Box<Sketch>>, KclError> {
@@ -982,6 +1023,13 @@ async fn inner_pattern_circular_2d(
     if args.ctx.context_type == crate::execution::ContextType::Mock {
         return Ok(starting_sketches);
     }
+    let data = CircularPattern2dData {
+        instances,
+        center,
+        arc_degrees,
+        rotate_duplicates,
+        use_original,
+    };
 
     let mut sketches = Vec::new();
     for sketch in starting_sketches.iter() {
@@ -1008,9 +1056,36 @@ async fn inner_pattern_circular_2d(
 
 /// A circular pattern on a 3D model.
 pub async fn pattern_circular_3d(exec_state: &mut ExecState, args: Args) -> Result<KclValue, KclError> {
-    let (data, solid_set): (CircularPattern3dData, SolidSet) = args.get_data_and_solid_set()?;
+    let solid_set: SolidSet = args.get_unlabeled_kw_arg("solidSet")?;
+    // The number of total instances. Must be greater than or equal to 1.
+    // This includes the original entity. For example, if instances is 2,
+    // there will be two copies -- the original, and one new copy.
+    // If instances is 1, this has no effect.
+    let instances: u32 = args.get_kw_arg("instances")?;
+    // The axis around which to make the pattern. This is a 3D vector.
+    let axis: [f64; 3] = args.get_kw_arg("axis")?;
+    // The center about which to make the pattern. This is a 3D vector.
+    let center: [f64; 3] = args.get_kw_arg("center")?;
+    // The arc angle (in degrees) to place the repetitions. Must be greater than 0.
+    let arc_degrees: f64 = args.get_kw_arg("arcDegrees")?;
+    // Whether or not to rotate the duplicates as they are copied.
+    let rotate_duplicates: bool = args.get_kw_arg("rotateDuplicates")?;
+    // If the target being patterned is itself a pattern, then, should you use the original solid,
+    // or the pattern?
+    let use_original: Option<bool> = args.get_kw_arg_opt("useOriginal")?;
 
-    let solids = inner_pattern_circular_3d(data, solid_set, exec_state, args).await?;
+    let solids = inner_pattern_circular_3d(
+        solid_set,
+        instances,
+        axis,
+        center,
+        arc_degrees,
+        rotate_duplicates,
+        use_original,
+        exec_state,
+        args,
+    )
+    .await?;
     Ok(solids.into())
 }
 
@@ -1024,21 +1099,38 @@ pub async fn pattern_circular_3d(exec_state: &mut ExecState, args: Args) -> Resu
 ///   |> circle({ center = [0, 0], radius = 1 }, %)
 ///
 /// example = extrude(exampleSketch, length = -5)
-///   |> patternCircular3d({
+///   |> patternCircular3d(
 ///        axis = [1, -1, 0],
 ///        center = [10, -20, 0],
 ///        instances = 11,
 ///        arcDegrees = 360,
 ///        rotateDuplicates = true
-///      }, %)
+///      )
 /// ```
 #[stdlib {
     name = "patternCircular3d",
     feature_tree_operation = true,
+    keywords = true,
+    unlabeled_first = true,
+    args = {
+        solid_set = { docs = "Which solid(s) to pattern" },
+        instances = { docs = "The number of total instances. Must be greater than or equal to 1. This includes the original entity. For example, if instances is 2, there will be two copies -- the original, and one new copy. If instances is 1, this has no effect."},
+        axis = { docs = "The axis around which to make the pattern. This is a 3D vector"},
+        center = { docs = "The center about which to make the pattern. This is a 3D vector."},
+        arc_degrees = { docs = "The arc angle (in degrees) to place the repetitions. Must be greater than 0."},
+        rotate_duplicates = { docs = "Whether or not to rotate the duplicates as they are copied."},
+        use_original = { docs = "If the target was sketched on an extrusion, setting this will use the original sketch as the target, not the entire joined solid. Defaults to false."},
+    }
 }]
+#[allow(clippy::too_many_arguments)]
 async fn inner_pattern_circular_3d(
-    data: CircularPattern3dData,
     solid_set: SolidSet,
+    instances: u32,
+    axis: [f64; 3],
+    center: [f64; 3],
+    arc_degrees: f64,
+    rotate_duplicates: bool,
+    use_original: Option<bool>,
     exec_state: &mut ExecState,
     args: Args,
 ) -> Result<Vec<Box<Solid>>, KclError> {
@@ -1055,6 +1147,14 @@ async fn inner_pattern_circular_3d(
     }
 
     let mut solids = Vec::new();
+    let data = CircularPattern3dData {
+        instances,
+        axis,
+        center,
+        arc_degrees,
+        rotate_duplicates,
+        use_original,
+    };
     for solid in starting_solids.iter() {
         let geometries = pattern_circular(
             CircularPattern::ThreeD(data.clone()),

src/wasm-lib/kcl/src/unparser.rs

@@ -16,12 +16,17 @@ impl Program {
     pub fn recast(&self, options: &FormatOptions, indentation_level: usize) -> String {
         let indentation = options.get_indentation(indentation_level);
 
-        let result = self
+        let mut result = self
             .shebang
             .as_ref()
             .map(|sh| format!("{}\n\n", sh.inner.content))
             .unwrap_or_default();
 
+        for start in &self.non_code_meta.start_nodes {
+            result.push_str(&start.recast(options, indentation_level));
+        }
+        let result = result; // Remove mutation.
+
         let result = self
             .body
             .iter()
@@ -48,17 +53,9 @@ impl Program {
             })
             .enumerate()
             .fold(result, |mut output, (index, recast_str)| {
-                let start_string = if index == 0 {
+                let start_string = if index == 0 && self.non_code_meta.start_nodes.is_empty() {
                     // We need to indent.
-                    if self.non_code_meta.start_nodes.is_empty() {
                     indentation.to_string()
-                    } else {
-                        self.non_code_meta
-                            .start_nodes
-                            .iter()
-                            .map(|start| start.recast(options, indentation_level))
-                            .collect()
-                    }
                 } else {
                     // Do nothing, we already applied the indentation elsewhere.
                     String::new()
@@ -334,9 +331,26 @@ impl CallExpressionKw {
                 .iter()
                 .map(|arg| arg.recast(options, indentation_level, ctxt)),
         );
-        let args = arg_list.join(", ");
+        let args = arg_list.clone().join(", ");
+        if arg_list.len() >= 4 {
+            let inner_indentation = if ctxt == ExprContext::Pipe {
+                options.get_indentation_offset_pipe(indentation_level + 1)
+            } else {
+                options.get_indentation(indentation_level + 1)
+            };
+            let mut args = arg_list.join(&format!(",\n{inner_indentation}"));
+            args.push(',');
+            let args = args;
+            let end_indent = if ctxt == ExprContext::Pipe {
+                options.get_indentation_offset_pipe(indentation_level)
+            } else {
+                options.get_indentation(indentation_level)
+            };
+            format!("{indent}{name}(\n{inner_indentation}{args}\n{end_indent})")
+        } else {
             format!("{indent}{name}({args})")
         }
+    }
 }
 
 impl LabeledArg {
@@ -797,6 +811,38 @@ mod tests {
     use super::*;
     use crate::{parsing::ast::types::FormatOptions, ModuleId};
 
+    #[test]
+    fn test_recast_annotations_without_body_items() {
+        let input = r#"@settings(defaultLengthUnit = in)
+"#;
+        let program = crate::parsing::top_level_parse(input).unwrap();
+        let output = program.recast(&Default::default(), 0);
+        assert_eq!(output, input);
+    }
+
+    #[test]
+    fn test_recast_annotations_in_function_body() {
+        let input = r#"fn myFunc() {
+  @meta(yes = true)
+  x = 2
+}
+"#;
+        let program = crate::parsing::top_level_parse(input).unwrap();
+        let output = program.recast(&Default::default(), 0);
+        assert_eq!(output, input);
+    }
+
+    #[test]
+    fn test_recast_annotations_in_function_body_without_items() {
+        let input = r#"fn myFunc() {
+  @meta(yes = true)
+}
+"#;
+        let program = crate::parsing::top_level_parse(input).unwrap();
+        let output = program.recast(&Default::default(), 0);
+        assert_eq!(output, input);
+    }
+
     #[test]
     fn test_recast_if_else_if_same() {
         let input = r#"b = if false {
@@ -1031,13 +1077,13 @@ sphere = startSketchOn('XZ')
      }, %)
   |> close()
   |> revolve({ axis: 'x' }, %)
-  |> patternCircular3d({
+  |> patternCircular3d(
        axis = [0, 0, 1],
        center = [0, 0, 0],
        repetitions = 10,
        arcDegrees = 360,
        rotateDuplicates = true
-     }, %)
+     )
 
 // Sketch and revolve the outside bearing
 outsideRevolve = startSketchOn('XZ')
@@ -1098,13 +1144,13 @@ sphere = startSketchOn('XZ')
      }, %)
   |> close()
   |> revolve({ axis = 'x' }, %)
-  |> patternCircular3d({
+  |> patternCircular3d(
        axis = [0, 0, 1],
        center = [0, 0, 0],
        repetitions = 10,
        arcDegrees = 360,
-       rotateDuplicates = true
-     }, %)
+       rotateDuplicates = true,
+     )
 
 // Sketch and revolve the outside bearing
 outsideRevolve = startSketchOn('XZ')
@@ -1329,6 +1375,18 @@ part001 = startSketchOn('XY')
         );
     }
 
+    #[test]
+    fn test_recast_empty_function_body_with_comments() {
+        let input = r#"fn myFunc() {
+  // Yo yo my comments.
+}
+"#;
+
+        let program = crate::parsing::top_level_parse(input).unwrap();
+        let output = program.recast(&Default::default(), 0);
+        assert_eq!(output, input);
+    }
+
     #[test]
     fn test_recast_large_file() {
         let some_program_string = r#"@settings(units=mm)
@@ -1417,11 +1475,11 @@ tabs_r = startSketchOn({
        radius = hole_diam / 2
      }, %), %)
   |> extrude(-thk, %)
-  |> patternLinear3d({
+  |> patternLinear3d(
        axis = [0, -1, 0],
        repetitions = 1,
        distance = length - 10
-     }, %)
+     )
   // build the tabs of the mounting bracket (left side)
 tabs_l = startSketchOn({
        plane: {
@@ -1444,11 +1502,7 @@ tabs_l = startSketchOn({
        radius = hole_diam / 2
      }, %), %)
   |> extrude(-thk, %)
-  |> patternLinear3d({
-       axis = [0, -1, 0],
-       repetitions = 1,
-       distance = length - 10
-     }, %)
+  |> patternLinear3d(axis = [0, -1, 0], repetitions = 1, distance = length - 10)
 "#;
         let program = crate::parsing::top_level_parse(some_program_string).unwrap();
 
@@ -1542,11 +1596,7 @@ tabs_r = startSketchOn({
        radius = hole_diam / 2
      }, %), %)
   |> extrude(-thk, %)
-  |> patternLinear3d({
-       axis = [0, -1, 0],
-       repetitions = 1,
-       distance = length - 10
-     }, %)
+  |> patternLinear3d(axis = [0, -1, 0], repetitions = 1, distance = length - 10)
 // build the tabs of the mounting bracket (left side)
 tabs_l = startSketchOn({
        plane = {
@@ -1569,11 +1619,7 @@ tabs_l = startSketchOn({
        radius = hole_diam / 2
      }, %), %)
   |> extrude(-thk, %)
-  |> patternLinear3d({
-       axis = [0, -1, 0],
-       repetitions = 1,
-       distance = length - 10
-     }, %)
+  |> patternLinear3d(axis = [0, -1, 0], repetitions = 1, distance = length - 10)
 "#
         );
     }

src/wasm-lib/kcl/tests/add_lots/artifact_graph_mind_map.snap

@@ -1,6 +0,0 @@
----
-source: kcl/src/simulation_tests.rs
-description: Artifact graph mind map add_lots.kcl
-extension: md
-snapshot_kind: binary
----

src/wasm-lib/kcl/tests/add_lots/artifact_graph_mind_map.snap.md

@@ -1,4 +0,0 @@
-```mermaid
-mindmap
-  root
-```

src/wasm-lib/kcl/tests/add_lots/program_memory.snap

@@ -81,37 +81,10 @@ description: Program memory after executing add_lots.kcl
             "start": 4,
             "type": "FunctionExpression"
           },
-          "memory": {
-            "environments": [
-              {
-                "bindings": {
-                  "HALF_TURN": {
-                    "type": "Number",
-                    "value": 180.0,
-                    "__meta": []
-                  },
-                  "QUARTER_TURN": {
-                    "type": "Number",
-                    "value": 90.0,
-                    "__meta": []
-                  },
-                  "THREE_QUARTER_TURN": {
-                    "type": "Number",
-                    "value": 270.0,
-                    "__meta": []
-                  },
-                  "ZERO": {
-                    "type": "Number",
-                    "value": 0.0,
-                    "__meta": []
-                  }
-                },
-                "parent": null
-              }
+          "memory": [
+            0,
+            1
           ],
-            "currentEnv": 0,
-            "return": null
-          },
           "__meta": [
             {
               "sourceRange": [
@@ -1543,9 +1516,29 @@ description: Program memory after executing add_lots.kcl
           ]
         }
       },
+      "snapshots": [
+        {
+          "parent_snapshot": null,
+          "data": {
+            "f": {
+              "type": "Tombstone",
+              "value": null,
+              "__meta": []
+            },
+            "x": {
+              "type": "Tombstone",
+              "value": null,
+              "__meta": []
+            }
+          }
+        }
+      ],
       "parent": null
     }
   ],
-  "currentEnv": 0,
-  "return": null
+  "currentEnv": [
+    0,
+    0
+  ],
+  "callStack": []
 }