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Add TypeGuard and TypeIs traversing in TypeTraverserVisitor (fixes #17029) #17071

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Mar 29, 2024
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Add TypeGuard and TypeIs traversing in TypeTraverserVisitor (fixes #17029) #17071

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af82942
Add TypeGuard traversing in TypeTraverserVisitor
sloboegen Mar 28, 2024
2558b00
Add TypeIs traversing in in TypeTraverserVisitor
sloboegen Mar 28, 2024
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3 changes: 3 additions & 0 deletions mypy/typetraverser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,9 @@ def visit_callable_type(self, t: CallableType) -> None:
t.ret_type.accept(self)
t.fallback.accept(self)

if t.type_guard is not None:
t.type_guard.accept(self)
Comment on lines +89 to +90
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Is this an issue for TypeIs as well? Probably as easy as adding an if t.type_is is not None clause here.

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Yes, please add an analogous test for TypeIs as well. It should behave exactly the same here.

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Done, thanks! It was interesting to learn about TypeIs :)


def visit_tuple_type(self, t: TupleType) -> None:
self.traverse_types(t.items)
t.partial_fallback.accept(self)
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12 changes: 12 additions & 0 deletions test-data/unit/check-typeguard.test
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Expand Up @@ -54,6 +54,18 @@ def main(a: object, b: object) -> None:
reveal_type(b) # N: Revealed type is "builtins.object"
[builtins fixtures/tuple.pyi]

[case testTypeGuardTypeVarReturn]
from typing import Callable, Optional, TypeVar
from typing_extensions import TypeGuard
T = TypeVar('T')
def is_str(x: object) -> TypeGuard[str]: pass
def main(x: object, type_check_func: Callable[[object], TypeGuard[T]]) -> T:
if not type_check_func(x):
raise Exception()
return x
reveal_type(main("a", is_str)) # N: Revealed type is "builtins.str"
[builtins fixtures/exception.pyi]

[case testTypeGuardIsBool]
from typing_extensions import TypeGuard
def f(a: TypeGuard[int]) -> None: pass
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