Michael Schimmel
4d9adccab5
The binder now uses an `UpvalueAnalyzer` to identify local variables that are captured by nested functions. These identified variables are marked with `is_boxed: true` during `DefLocal` node creation. The VM then uses this flag to wrap such variables in a `Value::Cell` (using `Rc<RefCell<_>>`) to ensure they can be mutated across function calls. feat: Introduce boxing for captured variables Add UpvalueAnalyzer to identify variables captured by nested lambdas. Modify Binder to use the analyzer and mark captured local variables for boxing. Update BoundKind::DefLocal to include an `is_boxed` flag. Update VM to box captured variables when they are defined. Add tests for upvalue capture detection.