8000 Fix recursion issue with nested instances and unions by Peilonrayz · Pull Request #9663 · python/mypy · GitHub
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Fix recursion issue with nested instances and unions #9663

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Merged
merged 4 commits into from
Aug 4, 2021
Merged

Fix recursion issue with nested instances and unions #9663

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6b6ebbf
Fix recursion issue with nested instances and unions
Peilonrayz Oct 30, 2020
616f0f6
Change to use `==` in `is_protocol_implementation`
Peilonrayz Nov 4, 2020
99cbcd9
Add test that verifies Union[a, b] == Union[b, a]
Peilonrayz Dec 29, 2020
c080dc5
Merge branch 'master' into master
hauntsaninja Aug 4, 2021
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Fix recursion issue with nested instances and unions
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@Peilonrayz
Peilonrayz committed Oct 30, 2020
commit 6b6ebbfc7ff230a7654ea0f450bcbef327634b58
1 change: 0 additions & 1 deletion mypy/sametypes.py
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Original file line number Diff line number Diff line change
Expand Up @@ -25,7 +25,6 @@ def is_same_type(left: Type, right: Type) -> bool:
# types can be simplified to non-union types such as Union[int, bool]
# -> int. It would be nice if we always had simplified union types but
# this is currently not the case, though it often is.
left = simplify_union(left)
right = simplify_union(right)

return left.accept(SameTypeVisitor(right))
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57 changes: 57 additions & 0 deletions test-data/unit/check-unions.test
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Expand Up @@ -1059,3 +1059,60 @@ x: Union[None, Any]
y: Union[int, None]
reveal_type(f(x, y)) # N: Revealed type is 'Union[None, Any, builtins.int]'
reveal_type(f(y, x)) # N: Revealed type is 'Union[builtins.int, None, Any]'

[case testNestedProtocolUnions]
from typing import Union, Iterator, Iterable
def foo(
values: Union[
Iterator[Union[
Iterator[Union[Iterator[int], Iterable[int]]],
Iterable[Union[Iterator[int], Iterable[int]]],
]],
Iterable[Union[
Iterator[Union[Iterator[int], Iterable[int]]],
Iterable[Union[Iterator[int], Iterable[int]]],
]],
]
) -> Iterator[int]:
for i in values:
for j in i:
for k in j:
yield k
foo([[[1]]])
[builtins fixtures/list.pyi]

[case testNestedProtocolGenericUnions]
from typing import Union, Iterator, List
def foo(
values: Union[
Iterator[Union[
Iterator[Union[Iterator[int], List[int]]],
List[Union[Iterator[int], List[int]]],
]],
List[Union[
Iterator[Union[Iterator[int], List[int]]],
List[Union[Iterator[int], List[int]]],
]],
]
) -> Iterator[int]:
for i in values:
for j in i:
for k in j:
yield k
foo([[[1]]])
[builtins fixtures/list.pyi]

[case testNestedProtocolGenericUnionsDeep]
from typing import TypeVar, Union, Iterator, List
T = TypeVar("T")
Iter = Union[Iterator[T], List[T]]
def foo(
values: Iter[Iter[Iter[Iter[Iter[int]]]]]) -> Iterator[int]:
for i in values:
for j in i:
for k in j:
for l in k:
for m in l:
yield m
foo([[[[[1]]]]])
[builtins fixtures/list.pyi]
0