Fix false negatives due to <field>-redefinition symbols in NamedTuples

brianschubert · brianschubert · commit 565e42fe808c · 2026-03-15T15:20:41.000-04:00
diff --git a/mypy/stubtest.py b/mypy/stubtest.py
@@ -467,7 +467,8 @@ def _is_decoratable(stub: nodes.SymbolNode) -> bool:
         )
     if stub.is_named_tuple:
         return all(
-            name.isidentifier() and not keyword.iskeyword(name) for name in stub.names.keys()
+            name.isidentifier() and not keyword.iskeyword(name)
+            for name in stub.metadata["namedtuple"]["fields"]
         )
     return True
 

Original file line number	Diff line number	Diff line change
`@@ -467,7 +467,8 @@ def _is_decoratable(stub: nodes.SymbolNode) -> bool:`
`467`	`467`	`)`
`468`	`468`	`if stub.is_named_tuple:`
`469`	`469`	`return all(`
`470`		`- name.isidentifier() and not keyword.iskeyword(name) for name in stub.names.keys()`
	`470`	`+ name.isidentifier() and not keyword.iskeyword(name)`
	`471`	`+ for name in stub.metadata["namedtuple"]["fields"]`
`471`	`472`	`)`
`472`	`473`	`return True`
`473`	`474`