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Fix crash when passing too many type arguments to generic base class accepting single ParamSpec #17770

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merged 2 commits into from
Sep 21, 2024
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Fix crash when passing too many type arguments to generic base class accepting single ParamSpec #17770

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8b6bafc
Fix crash when passing multiple type args to base expecting 1 ParamSpec
brianschubert Sep 13, 2024
73f4635
Add test case for crash reproducer
brianschubert Sep 13, 2024
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5 changes: 2 additions & 3 deletions mypy/semanal.py
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Original file line number Diff line number Diff line change
Expand Up @@ -5904,9 +5904,8 @@ def analyze_type_application_args(self, expr: IndexExpr) -> list[Type] | None:

if has_param_spec and num_args == 1 and types:
first_arg = get_proper_type(types[0])
if not (
len(types) == 1 and isinstance(first_arg, (Parameters, ParamSpecType, AnyType))
):
single_any = len(types) == 1 and isinstance(first_arg, AnyType)
if not (single_any or any(isinstance(t, (Parameters, ParamSpecType)) for t in types)):
types = [Parameters(types, [ARG_POS] * len(types), [None] * len(types))]

return types
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9 changes: 9 additions & 0 deletions test-data/unit/check-parameter-specification.test
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Expand Up @@ -1836,6 +1836,15 @@ c: C[int, [int, str], str] # E: Nested parameter specifications are not allowed
reveal_type(c) # N: Revealed type is "__main__.C[Any]"
[builtins fixtures/paramspec.pyi]

[case testParamSpecInheritNoCrashOnNested]
from typing import Generic
from typing_extensions import ParamSpec

P = ParamSpec("P")
class C(Generic[P]): ...
class D(C[int, [int, str], str]): ... # E: Nested parameter specifications are not allowed
[builtins fixtures/paramspec.pyi]

[case testParamSpecConcatenateSelfType]
from typing import Callable
from typing_extensions import ParamSpec, Concatenate
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