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[ty] add support for cyclic legacy generic protocols (#20125)

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## Summary

Just add the necessary Salsa cycle handling.

## Test Plan

Added mdtest.
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Carl Meyer 2025-08-28 09:58:01 -07:00 • committed by GitHub
parent f4362b95d7
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22
crates/ty_python_semantic/resources/mdtest/protocols.md
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@ -2339,6 +2339,28 @@ class Bar(Protocol[S]):
z: S | Bar[S]
```
### Recursive legacy generic protocol
```py
from typing import Generic, TypeVar, Protocol
T = TypeVar("T")
class P(Protocol[T]):
attr: "P[T] | T"
class A(Generic[T]):
attr: T
class B(A[P[int]]):
pass
def f(b: B):
reveal_type(b) # revealed: B
reveal_type(b.attr) # revealed: P[int]
reveal_type(b.attr.attr) # revealed: P[int] | int
```
### Recursive generic protocols with property members
An early version of <https://github.com/astral-sh/ruff/pull/19936> caused stack overflows on this