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Always allow returning Any from lambda #15413

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merged 2 commits into from
Jun 11, 2023
Merged

Always allow returning Any from lambda #15413

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4869b5b
Allways allow returning Any form lambda
ilevkivskyi Jun 11, 2023
063504c
also test aliased lambda
hauntsaninja Jun 11, 2023
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1 change: 1 addition & 0 deletions mypy/checker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4270,6 +4270,7 @@ def check_return_stmt(self, s: ReturnStmt) -> None:
isinstance(return_type, Instance)
and return_type.type.fullname == "builtins.object"
)
and not is_lambda
):
self.msg.incorrectly_returning_any(return_type, s)
return
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11 changes: 11 additions & 0 deletions test-data/unit/check-flags.test
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Expand Up @@ -2184,3 +2184,14 @@ def f(x: bytes, y: bytearray, z: memoryview) -> None:
follow_imports = skip
follow_imports_for_stubs = true
[builtins fixtures/dict.pyi]

[case testReturnAnyLambda]
# flags: --warn-return-any
from typing import Any, Callable

def cb(f: Callable[[int], int]) -> None: ...
a: Any
cb(lambda x: a) # OK

fn = lambda x: a
cb(fn)