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Add comments about mypy limitation regarding TypeVar constraints (#7350)

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Martin Fischer
2022-02-22 12:29:39 +01:00
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parent d6ce3abd68
commit 51a3cf072c
2 changed files with 7 additions and 0 deletions
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stdlib/re.pyi
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@@ -51,6 +51,11 @@ if sys.version_info < (3, 7):
# undocumented
_pattern_type: type
# Type-wise these overloads are unnecessary, they could also be modeled using
# unions in the parameter types. However mypy has a bug regarding TypeVar
# constraints (https://github.com/python/mypy/issues/11880),
# which limits us here because AnyStr is a constrained TypeVar.
@overload
def compile(pattern: AnyStr, flags: _FlagsType = ...) -> Pattern[AnyStr]: ...
@overload