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Fix "Cannot determine type of Any" issue in typeshed #12429

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Fix "Cannot determine type of Any" issue in typeshed #12429

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17 changes: 12 additions & 5 deletions mypy/semanal.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2878,11 +2878,18 @@ def analyze_name_lvalue(self,
lvalue.fullname = var._fullname
else:
lvalue.fullname = lvalue.name
if self.is_func_scope():
if unmangle(name) == '_':
# Special case for assignment to local named '_': always infer 'Any'.
typ = AnyType(TypeOfAny.special_form)
self.store_declared_types(lvalue, typ)

# Special case for assignment to local named '_': always infer 'Any'.
is_special_unused = self.is_func_scope() and unmangle(name) == '_'

# Special case, `Any` is defined as `= object()` in typeshed,
# so we need to make it a real type variable.
is_typing_any = var.fullname == 'typing.Any'

if is_special_unused or is_typing_any:
typ = AnyType(TypeOfAny.special_form)
self.store_declared_types(lvalue, typ)

if is_final and self.is_final_redefinition(kind, name):
self.fail("Cannot redefine an existing name as final", lvalue)
else:
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