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add test for new union syntax on generic bounds #11431

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merged 2 commits into from
Nov 3, 2021
Merged

add test for new union syntax on generic bounds #11431

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add testTypeVarBoundToNewUnionAttributeAccess
DetachHead Nov 1, 2021
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add testTypeVarBoundToNewUnionAttributeAccess
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30 changes: 29 additions & 1 deletion test-data/unit/check-generic-subtyping.test
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Original file line number Diff line number Diff line change
Expand Up @@ -818,7 +818,7 @@ class Y(Generic[T]):
return U() # E: Incompatible return value type (got "U", expected "T")


[case testTypeVarBoundToUnionAttributeAccess]
[case testTypeVarBoundToOldUnionAttributeAccess]
from typing import Union, TypeVar

class U:
Expand All @@ -844,6 +844,34 @@ main:15: error: Item "U" of the upper bound "Union[U, V, W]" of type variable "T
main:15: error: Item "V" of the upper bound "Union[U, V, W]" of type variable "T" has no attribute "c"


[case testTypeVarBoundToNewUnionAttributeAccess]
# flags: --python-version 3.10
from typing import TypeVar

class U:
a: int
class V:
b: int
class W:
c: int

T = TypeVar("T", bound=U | V | W)

def f(x: T) -> None:
x.a # E
x.b = 1 # E
del x.c # E

[builtins fixtures/tuple.pyi]
[out]
main:14: error: Item "V" of the upper bound "Union[U, V, W]" of type variable "T" has no attribute "a"
main:14: error: Item "W" of the upper bound "Union[U, V, W]" of type variable "T" has no attribute "a"
main:15: error: Item "U" of the upper bound "Union[U, V, W]" of type variable "T" has no attribute "b"
main:15: error: Item "W" of the upper bound "Union[U, V, W]" of type variable "T" has no attribute "b"
main:16: error: Item "U" of the upper bound "Union[U, V, W]" of type variable "T" has no attribute "c"
main:16: error: Item "V" of the upper bound "Union[U, V, W]" of type variable "T" has no attribute "c"


[case testSubtypingIterableUnpacking1]
# https://github.com/python/mypy/issues/11138
from typing import Generic, Iterator, TypeVar
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