Fix typed splat function parameters in Python.

[bm-w]

This addresses issue #476.

Eliding the identifier node type in the stanza query allows it to erroneously match list_splat_pattern or dictionary_splat_pattern when those appear within a typed_parameter. This causes the stack graph generation to fail with an error:

0: Error executing statement edge @name.def -> @param.param_name at (871, 3)
    src/stack-graphs.tsg:871:3:
    871 |   edge @name.def -> @param.param_name
        |   ^
    in stanza
    src/stack-graphs.tsg:861:1:
    861 | [
        | ^
    matching (typed_parameter) node
    test/typed_splat_parameters.py:3:9:
    5 | def foo(*bar: typing.Any):
        |         ^
1: Evaluating edge source
2: Undefined scoped variable [syntax node list_splat_pattern (3, 9)].def

The fragment of the parsed Tree-sitter tree for such a parameter is:

(typed_parameter [3, 9] - [3, 25])
  (list_splat_pattern [3, 9] - [3, 13])
    (identifier [3, 10] - [3, 13]))
  type: (…))

As of v0.23.5 of the Python grammar, typed_parameter may contain identifier or either of the *_splat_pattern node types. As such, making the identifier node type explicit fixes the issue precisely without introducing other problems.

[Copilot]

Pull Request Overview

This PR fixes an issue with the Tree-sitter Python grammar by explicitly eliding the identifier node type in typed_parameter nodes. The changes ensure that list_splat_pattern and dictionary_splat_pattern are not erroneously matched, resolving stack graph generation errors.

• Updated tests to validate proper behavior for typed splat function parameters.
• Added two test cases to confirm correct handling of both *args and **kwargs.

Files not reviewed (1)

• languages/tree-sitter-stack-graphs-python/src/stack-graphs.tsg: Language not supported