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KCL: Fix 'cryptic' error when referencing a variable in its own declaration (#7325)

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Previously, `x = cos(x)` would just say "`x` is undefined". Now it says that `x` cannot be referenced in its own definition, try using a different variable instead.

To do this, I've added a new `Option<String>` field to the mod-local executor context, tracking the current variable declaration. This means cloning some strings, implying a small performance hit. I think it's fine, for the better diagnostics.

In the future we could refactor this to use a &str or store variable labels in stack-allocated strings like docs.rs/compact_str or something.

Closes https://github.com/KittyCAD/modeling-app/issues/6072
This commit is contained in:
Adam Chalmers
2025-06-02 17:25:55 -05:00
committed by GitHub
parent 2bb6c74f42
commit 7680605085
15 changed files with 230 additions and 39 deletions
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75
rust/kcl-lib/tests/var_ref_in_own_def/ast.snap Normal file
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@ -0,0 +1,75 @@
---
source: kcl-lib/src/simulation_tests.rs
description: Result of parsing var_ref_in_own_def.kcl
---
{
"Ok": {
"body": [
{
"commentStart": 0,
"declaration": {
"commentStart": 0,
"end": 0,
"id": {
"commentStart": 0,
"end": 0,
"name": "x",
"start": 0,
"type": "Identifier"
},
"init": {
"callee": {
"abs_path": false,
"commentStart": 0,
"end": 0,
"name": {
"commentStart": 0,
"end": 0,
"name": "cos",
"start": 0,
"type": "Identifier"
},
"path": [],
"start": 0,
"type": "Name"
},
"commentStart": 0,
"end": 0,
"start": 0,
"type": "CallExpressionKw",
"type": "CallExpressionKw",
"unlabeled": {
"abs_path": false,
"commentStart": 0,
"end": 0,
"name": {
"commentStart": 0,
"end": 0,
"name": "x",
"start": 0,
"type": "Identifier"
},
"path": [],
"start": 0,
"type": "Name",
"type": "Name"
}
},
"start": 0,
"type": "VariableDeclarator"
},
"end": 0,
"kind": "const",
"preComments": [
"// This won't work, because `x` is being referenced in its own definition."
],
"start": 0,
"type": "VariableDeclaration",
"type": "VariableDeclaration"
}
],
"commentStart": 0,
"end": 0,
"start": 0
}
}