Commits on Apr 11, 2024

1. starlark: add debug API for Locals and FreeVars …

   This change adds the following new API to allow debugging tools
   and built-in functions access to the internals of Function values
   and call frames:
   
   package starlark
   
   type Binding struct {
          Name string
          Pos  syntax.Position
   }
   
   func (fr *frame) NumLocals() int
   func (fr *frame) Local(i int) (Binding, Value)
   
   type DebugFrame interface {
       ...
       NumLocals() int
       Local(i int) (Binding, Value)
   }
   
   func (fn *Function) NumFreeVars() int
   func (fn *Function) FreeVar(i int) (Binding, Value)
   
   This is strictly a breaking change, but the changed functions
   (the Local methods) were previously documented as experimental.
   The fix is straightforward.
   
   Also, a test of DebugFrame to write an 'env' function in
   a similar vein to Python's 'dir' function.
   
   Fixes #538

   

   adonovan committed Apr 11, 2024
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