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[ty] Fallback to Unknown if no type is stored for an expression (#19517)

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## Summary

See discussion at
https://github.com/astral-sh/ruff/pull/19478/files#r2223870292

Fixes https://github.com/astral-sh/ty/issues/865

## Test Plan

Added one mdtest for invalid Callable annotation; removed `pull-types:
skip` from that test file.

Co-authored-by: lipefree <willy.ngo.2000@gmail.com>
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Carl Meyer 2025-07-24 19:05:32 -07:00 • committed by GitHub
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17
crates/ty_python_semantic/resources/mdtest/annotations/callable.md
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@ -58,8 +58,6 @@ def _(c: Callable[[int, 42, str, False], None]):
### Missing return type
<!-- pull-types:skip -->
Using a parameter list:
```py
@ -90,6 +88,21 @@ def _(c: Callable[ # error: [invalid-type-form] "Special form `typing.Callable`
reveal_type(c) # revealed: (...) -> Unknown
```
### Invalid parameters and return type
```py
from typing import Callable
# fmt: off
def _(c: Callable[
# error: [invalid-type-form] "Int literals are not allowed in this context in a type expression"
{1, 2}, 2 # error: [invalid-type-form] "The first argument to `Callable` must be either a list of types, ParamSpec, Concatenate, or `...`"
]
):
reveal_type(c) # revealed: (...) -> Unknown
```
### More than two arguments
We can't reliably infer the callable type if there are more then 2 arguments because we don't know