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[ty] Use 'unknown' specialization for upper bound on Self (#20325)

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## Summary

closes https://github.com/astral-sh/ty/issues/1156

## Test Plan

Added a regression test
This commit is contained in:
David Peter 2025-09-10 17:00:28 +02:00 • committed by GitHub
parent 57d1f7132d
commit 65982a1e14
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2 changed files with 19 additions and 4 deletions
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19
crates/ty_python_semantic/resources/mdtest/annotations/self.md
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@ -2,7 +2,7 @@
```toml
[environment]
python-version = "3.11"
python-version = "3.13"
```
`Self` is treated as if it were a `TypeVar` bound to the class it's being used on.
@ -147,6 +147,23 @@ class Shape:
return self
```
## `Self` for classes with a default value for their generic parameter
This is a regression test for <https://github.com/astral-sh/ty/issues/1156>.
```py
from typing import Self
class Container[T = bytes]:
def __init__(self: Self, data: T | None = None) -> None:
self.data = data
reveal_type(Container()) # revealed: Container[bytes]
reveal_type(Container(1)) # revealed: Container[int]
reveal_type(Container("a")) # revealed: Container[str]
reveal_type(Container(b"a")) # revealed: Container[bytes]
```
## Invalid Usage
`Self` cannot be used in the signature of a function or variable.