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[syntax-errors] Duplicate type parameter names (#16858)

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Summary
--

Detects duplicate type parameter names in function definitions, class
definitions, and type alias statements.

I also boxed the `type_params` field on `StmtTypeAlias` to make it
easier to
`match` with functions and classes. (That's the reason for the red-knot
code
owner review requests, sorry!)

Test Plan
--

New `ruff_python_syntax_errors` unit tests.

Fixes #11119.
This commit is contained in:
Brent Westbrook 2025-03-21 15:06:22 -04:00 • committed by GitHub
parent 2baaedda6c
commit e4f5fe8cf7
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11 changed files with 1043 additions and 9 deletions
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7
crates/ruff_python_parser/resources/inline/err/duplicate_type_parameter_names.py Normal file
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@ -0,0 +1,7 @@
type Alias[T, T] = ...
def f[T, T](t: T): ...
class C[T, T]: ...
type Alias[T, U: str, V: (str, bytes), *Ts, **P, T = default] = ...
def f[T, T, T](): ... # two errors
def f[T, *T](): ... # star is still duplicate
def f[T, **T](): ... # as is double star