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Handle TypeVarTupleType when checking overload constraints #16428

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Nov 10, 2023
Merged

Handle TypeVarTupleType when checking overload constraints #16428

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c49edce
Add testTypeVarTupleOverloadArbitraryLength which crashes
robjhornby Nov 9, 2023
eb09ac1
Make testTypeVarTupleOverloadArbitraryLength pass
robjhornby Nov 9, 2023
1342136
Apply suggestions from code review
ilevkivskyi Nov 10, 2023
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2 changes: 1 addition & 1 deletion mypy/constraints.py
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Original file line number Diff line number Diff line change
Expand Up @@ -949,7 +949,7 @@ def visit_instance(self, template: Instance) -> list[Constraint]:
for item in actual.items:
if isinstance(item, UnpackType):
unpacked = get_proper_type(item.type)
if isinstance(unpacked, TypeVarType):
if isinstance(unpacked, (TypeVarType, TypeVarTupleType)):
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# Cannot infer anything for T from [T, ...] <: *Ts
continue
assert (
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22 changes: 22 additions & 0 deletions test-data/unit/check-typevar-tuple.test
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Expand Up @@ -1789,6 +1789,28 @@ def test(a: Container[Any], b: Container[int], c: Container[str]):
reveal_type(build(b, c)) # N: Revealed type is "__main__.Array[builtins.int, builtins.str]"
[builtins fixtures/tuple.pyi]

[case testTypeVarTupleOverloadArbitraryLength]
from typing import Any, Tuple, TypeVar, TypeVarTuple, Unpack, overload

T = TypeVar("T")
Ts = TypeVarTuple("Ts")


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@overload
def add(self: Tuple[Unpack[Ts]], other: Tuple[T]) -> Tuple[Unpack[Ts], T]:
...
@overload
def add(self: Tuple[T, ...], other: Tuple[T, ...]) -> Tuple[T, ...]:
...
def add(self: Any, other: Any) -> Any:
...


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def test(a: Tuple[int, str], b: Tuple[bool], c: Tuple[bool, ...]):
reveal_type(add(a, b)) # N: Revealed type is "Tuple[builtins.int, builtins.str, builtins.bool]"
reveal_type(add(b, c)) # N: Revealed type is "builtins.tuple[builtins.bool, ...]"
[builtins fixtures/tuple.pyi]

[case testTypeVarTupleIndexOldStyleNonNormalizedAndNonLiteral]
from typing import Any, Tuple
from typing_extensions import Unpack
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