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Narrow type variable bounds in binder#19183

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Reorder branches in narrowing logic
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@ilevkivskyi
ilevkivskyi committedMay 31, 2025
commite2fadecbfbf44132087a777bc3f63ab10b22598f
8 changes: 4 additions & 4 deletionsmypy/meet.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -150,6 +150,10 @@ def narrow_declared_type(declared: Type, narrowed: Type) -> Type:
return make_simplified_union(
[narrow_declared_type(declared, x) for x in narrowed.relevant_items()]
)
elif isinstance(narrowed, UnionType):
return make_simplified_union(
[narrow_declared_type(declared, x) for x in narrowed.relevant_items()]
)
elif (
isinstance(declared, TypeVarType)
and not has_type_vars(original_narrowed)
Expand All@@ -161,10 +165,6 @@ def narrow_declared_type(declared: Type, narrowed: Type) -> Type:
return UninhabitedType()
else:
return NoneType()
elif isinstance(narrowed, UnionType):
return make_simplified_union(
[narrow_declared_type(declared, x) for x in narrowed.relevant_items()]
)
elif isinstance(narrowed, AnyType):
return original_narrowed
elif isinstance(narrowed, TypeVarType) and is_subtype(narrowed.upper_bound, declared):
Expand Down
18 changes: 18 additions & 0 deletionstest-data/unit/check-typeguard.test
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Expand Up@@ -777,3 +777,21 @@ def handle(model: Model) -> int:
return process_model(model)
return 0
[builtins fixtures/tuple.pyi]

[case testTypeGuardRestrictTypeVarUnion]
from typing import Union, TypeVar
from typing_extensions import TypeGuard

class A:
x: int
class B:
x: str

def is_b(x: object) -> TypeGuard[B]: ...

T = TypeVar("T")
def test(x: T) -> T:
if isinstance(x, A) or is_b(x):
reveal_type(x.x) # N: Revealed type is "Union[builtins.int, builtins.str]"
return x
[builtins fixtures/isinstance.pyi]
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