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ruff/crates/ty_python_semantic/resources/mdtest/cycle.md
Carl Meyer 4850c187ea
[ty] add cycle handling for FunctionType::signature query (#17833) 
This fixes cycle panics in several ecosystem projects (moved to
`good.txt` in a following PR
https://github.com/astral-sh/ruff/pull/17834 because our mypy-primer job
doesn't handle it well if we move projects to `good.txt` in the same PR
that fixes `ty` to handle them), as well as in the minimal case in the
added mdtest. It also fixes a number of panicking fuzzer seeds. It
doesn't appear to cause any regression in any ecosystem project or any
fuzzer seed.
2025-05-05 12:12:38 -07:00

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Cycles

Function signature

Deferred annotations can result in cycles in resolving a function signature:

from __future__ import annotations

# error: [invalid-type-form]
def f(x: f):
    pass

reveal_type(f)  # revealed: def f(x: Unknown) -> Unknown