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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`
34 lines
645 B
Markdown
34 lines
645 B
Markdown
# Cycles
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## Function signature
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Deferred annotations can result in cycles in resolving a function signature:
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```py
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from __future__ import annotations
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# error: [invalid-type-form]
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def f(x: f):
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pass
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reveal_type(f) # revealed: def f(x: Unknown) -> Unknown
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```
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## Unpacking
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See: <https://github.com/astral-sh/ty/issues/364>
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```py
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class Point:
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def __init__(self, x: int = 0, y: int = 0) -> None:
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self.x = x
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self.y = y
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def replace_with(self, other: "Point") -> None:
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self.x, self.y = other.x, other.y
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p = Point()
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reveal_type(p.x) # revealed: Unknown | int
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reveal_type(p.y) # revealed: Unknown | int
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```
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