Skip to content

Don't expand PEP 695 aliases when checking node fullnames #19699

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Aug 20, 2025
Merged

Don't expand PEP 695 aliases when checking node fullnames #19699

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
2 changes: 1 addition & 1 deletion mypy/semanal.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -7678,7 +7678,7 @@ def refers_to_fullname(node: Expression, fullnames: str | tuple[str, ...]) -> bo
return False
if node.fullname in fullnames:
return True
if isinstance(node.node, TypeAlias):
if isinstance(node.node, TypeAlias) and not node.node.python_3_12_type_alias:
return is_named_instance(node.node.target, fullnames)
return False

Expand Down
16 changes: 16 additions & 0 deletions test-data/unit/check-python312.test
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -2095,3 +2095,19 @@ from dataclasses import dataclass
class Test[*Ts, R]:
a: Callable[[*Ts], R]
[builtins fixtures/dict.pyi]

[case testPEP695AliasDoesNotReferToFullname]
# https://github.com/python/mypy/issues/19698
from typing import TypeAliasType
type D = dict
type T = type
type TA = TypeAliasType

D() # E: "TypeAliasType" not callable
X = TA("Y") # E: "TypeAliasType" not callable

x: object
if T(x) is str: # E: "TypeAliasType" not callable
reveal_type(x) # N: Revealed type is "builtins.object"
[builtins fixtures/tuple.pyi]
[typing fixtures/typing-full.pyi]
Loading