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[ty] Fix panic when trying to pull types for subscript expressions inside Callable type expressions (#18534)

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Alex Waygood 2025-06-09 11:26:10 +01:00 • committed by GitHub
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crates/ty_python_semantic/resources/mdtest/annotations/callable.md
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@ -252,6 +252,31 @@ def _(c: Callable[[Concatenate[int, str, ...], int], int]):
reveal_type(c) # revealed: (...) -> int
```
Other type expressions can be nested inside `Concatenate`:
```py
def _(c: Callable[[Concatenate[int | str, type[str], ...], int], int]):
# TODO: Should reveal the correct signature
reveal_type(c) # revealed: (...) -> int
```
But providing fewer than 2 arguments to `Concatenate` is an error:
```py
# fmt: off
def _(
c: Callable[Concatenate[int], int], # error: [invalid-type-form] "Special form `typing.Concatenate` expected at least 2 parameters but got 1"
d: Callable[Concatenate[(int,)], int], # error: [invalid-type-form] "Special form `typing.Concatenate` expected at least 2 parameters but got 1"
e: Callable[Concatenate[()], int] # error: [invalid-type-form] "Special form `typing.Concatenate` expected at least 2 parameters but got 0"
):
reveal_type(c) # revealed: (...) -> int
reveal_type(d) # revealed: (...) -> int
reveal_type(e) # revealed: (...) -> int
# fmt: on
```
## Using `typing.ParamSpec`
```toml