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## Summary This PR adds cycle handling for `infer_unpack_types` based on the analysis in astral-sh/ty#364. Fixes: astral-sh/ty#364 ## Test Plan Add a cycle handling test for unpacking in `cycle.md`
645 B
645 B
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
Unpacking
See: https://github.com/astral-sh/ty/issues/364
class Point:
def __init__(self, x: int = 0, y: int = 0) -> None:
self.x = x
self.y = y
def replace_with(self, other: "Point") -> None:
self.x, self.y = other.x, other.y
p = Point()
reveal_type(p.x) # revealed: Unknown | int
reveal_type(p.y) # revealed: Unknown | int