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Support TypeAliasType in a class scope #17038

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Merged
JelleZijlstra merged 1 commit into from
Mar 16, 2024
Merged

Support TypeAliasType in a class scope #17038

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2 changes: 1 addition & 1 deletion mypy/semanal.py
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Original file line number Diff line number Diff line change
Expand Up @@ -3657,7 +3657,7 @@ def check_and_set_up_type_alias(self, s: AssignmentStmt) -> bool:
return False

non_global_scope = self.type or self.is_func_scope()
if not pep_613 and isinstance(rvalue, RefExpr) and non_global_scope:
if not pep_613 and not pep_695 and isinstance(rvalue, RefExpr) and non_global_scope:
# Fourth rule (special case): Non-subscripted right hand side creates a variable
# at class and function scopes. For example:
#
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5 changes: 5 additions & 0 deletions test-data/unit/check-type-aliases.test
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Expand Up @@ -1074,6 +1074,11 @@ TestType = TypeAliasType("TestType", Union[int, str])
x: TestType = 42
y: TestType = 'a'
z: TestType = object() # E: Incompatible types in assignment (expression has type "object", variable has type "Union[int, str]")

class A:
ClassAlias = TypeAliasType("ClassAlias", int)
xc: A.ClassAlias = 1
yc: A.ClassAlias = "" # E: Incompatible types in assignment (expression has type "str", variable has type "int")
[builtins fixtures/tuple.pyi]

[case testTypeAliasTypeInvalid]
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