Accept idents as KW args (#6644)

Support kw arg/local variable shorthand

Signed-off-by: Nick Cameron <nrc@ncameron.org>

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

@@ -59,7 +59,9 @@ impl Arg {
 #[derive(Debug, Clone, Default)]
 pub struct KwArgs {
     /// Unlabeled keyword args. Currently only the first arg can be unlabeled.
-    pub unlabeled: Option<Arg>,
+    /// If the argument was a local variable, then the first element of the tuple is its name
+    /// which may be used to treat this arg as a labelled arg.
+    pub unlabeled: Option<(Option<String>, Arg)>,
     /// Labeled args.
     pub labeled: IndexMap<String, Arg>,
     pub errors: Vec<Arg>,
@@ -342,6 +344,7 @@ impl Args {
         self.kw_args
             .unlabeled
             .as_ref()
+            .map(|(_, a)| a)
             .or(self.args.first())
             .or(self.pipe_value.as_ref())
     }

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

@@ -48,7 +48,7 @@ async fn call_map_closure(
     ctxt: &ExecutorContext,
 ) -> Result<KclValue, KclError> {
     let kw_args = KwArgs {
-        unlabeled: Some(Arg::new(input, source_range)),
+        unlabeled: Some((None, Arg::new(input, source_range))),
         labeled: Default::default(),
         errors: Vec::new(),
     };
@@ -104,7 +104,7 @@ async fn call_reduce_closure(
     let mut labeled = IndexMap::with_capacity(1);
     labeled.insert("accum".to_string(), Arg::new(accum, source_range));
     let kw_args = KwArgs {
-        unlabeled: Some(Arg::new(elem, source_range)),
+        unlabeled: Some((None, Arg::new(elem, source_range))),
         labeled,
         errors: Vec::new(),
     };

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

@@ -424,7 +424,7 @@ async fn make_transform<T: GeometryTrait>(
         meta: vec![source_range.into()],
     };
     let kw_args = KwArgs {
-        unlabeled: Some(Arg::new(repetition_num, source_range)),
+        unlabeled: Some((None, Arg::new(repetition_num, source_range))),
         labeled: Default::default(),
         errors: Vec::new(),
     };