Skip to content

Infer constraints eagerly if actual is Any #19190

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
Jun 1, 2025
Merged

Infer constraints eagerly if actual is Any #19190

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/constraints.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -416,7 +416,7 @@ def _infer_constraints(
infer_constraints_if_possible(t_item, actual, direction)
for t_item in template.items
],
eager=False,
eager=isinstance(actual, AnyType),
)
if result:
return result
Expand Down
10 changes: 10 additions & 0 deletions test-data/unit/check-inference.test
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -4071,3 +4071,13 @@ def check_or_nested(maybe: bool) -> None:
reveal_type(foo) # N: Revealed type is "builtins.list[builtins.int]"
reveal_type(bar) # N: Revealed type is "builtins.list[builtins.int]"
reveal_type(baz) # N: Revealed type is "builtins.list[builtins.int]"

[case testInferOptionalAgainstAny]
from typing import Any, Optional, TypeVar

a: Any
oa: Optional[Any]
T = TypeVar("T")
def f(x: Optional[T]) -> T: ...
reveal_type(f(a)) # N: Revealed type is "Any"
reveal_type(f(oa)) # N: Revealed type is "Any"