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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
11 changed files with 1043 additions and 9 deletions
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2
crates/ruff_python_ast/ast.toml
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@@ -104,7 +104,7 @@ fields = [{ name = "targets", type = "Expr*" }]
doc = "See also [TypeAlias](https://docs.python.org/3/library/ast.html#ast.TypeAlias)"
fields = [
{ name = "name", type = "Expr" },
{ name = "type_params", type = "TypeParams?" },
{ name = "type_params", type = "Box<crate::TypeParams>?" },
{ name = "value", type = "Expr" },
]