10000 Fix bug in constraints solver regarding `ParamSpec` upper bounds by AlexWaygood · Pull Request #12938 · python/mypy · GitHub
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Fix bug in constraints solver regarding ParamSpec upper bounds #12938

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Merged
merged 1 commit into from
Jun 4, 2022
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Fix bug in constraints solver regarding ParamSpec upper bounds #12938

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Fix bug in constraints solver regarding ParamSpec upper bounds
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@AlexWaygood
AlexWaygood committed Jun 4, 2022
commit 4422a21f36effb47ce004c9ba2b119b69146f8ec
2 changes: 2 additions & 0 deletions mypy/constraints.py
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Expand Up @@ -571,6 +571,8 @@ def visit_instance(self, template: Instance) -> List[Constraint]:
if not actual.values:
return infer_constraints(template, actual.upper_bound, self.direction)
return []
elif isinstance(actual, ParamSpecType):
return infer_constraints(template, actual.upper_bound, self.direction)
else:
return []

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7 changes: 6 additions & 1 deletion t A042 est-data/unit/check-parameter-specification.test
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Expand Up @@ -1066,16 +1066,21 @@ def run_job(job: Job[...]) -> T: ...
[builtins fixtures/tuple.pyi]

[case testTupleAndDictOperationsOnParamSpecArgsAndKwargs]
from typing import Callable
from typing import Callable, Iterator, Iterable, TypeVar, Tuple
from typing_extensions import ParamSpec

P = ParamSpec('P')
T = TypeVar('T')
def enumerate(x: Iterable[T]) -> Iterator[Tuple[int, T]]: ...

def func(callback: Callable[P, str]) -> Callable[P, str]:
def inner(*args: P.args, **kwargs: P.kwargs) -> str:
reveal_type(args[5]) # N: Revealed type is "builtins.object"
for a in args:
reveal_type(a) # N: Revealed type is "builtins.object"
for idx, a in enumerate(args):
reveal_type(idx) # N: Revealed type is "builtins.int"
reveal_type(a) # N: Revealed type is "builtins.object"
b = 'foo' in args
reveal_type(b) # N: Revealed type is "builtins.bool"
reveal_type(args.count(42)) # N: Revealed type is "builtins.int"
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