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[ty] Cover match subjects that refer to later captures #28992

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[ty] Cover match subjects that refer to later captures #28992

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14 changes: 14 additions & 0 deletions crates/ty_python_semantic/resources/mdtest/narrow/match.md
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Expand Up @@ -3644,6 +3644,20 @@ def guard_with_changing_flag(value: int | str, again: bool) -> None:
flag = True
```

## Match subject refers to a later capture

Regression test for <https://github.com/astral-sh/ty/issues/4610>.

```py
subject = [1]
for _ in [0]:
match [x for x in subject]:
case subject.attr: # error: [unresolved-attribute]
pass
case b"" as subject:
pass
```

## Value patterns

Value patterns are evaluated by equality, which is overridable. Apart from the optimistic treatment
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