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[ty] Do not assume that fields have a default value (#20914)

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## Summary

fixes https://github.com/astral-sh/ty/issues/1366

## Test Plan

Added regression test
This commit is contained in:
David Peter 2025-10-16 12:49:24 +02:00 • committed by GitHub
parent c9dfb51f49
commit 0cc663efcd
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5 changed files with 29 additions and 19 deletions
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2
crates/ty_python_semantic/resources/mdtest/dataclasses/dataclasses.md
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@ -497,6 +497,8 @@ class A:
a: str = field(kw_only=False)
b: int = 0
reveal_type(A.__init__) # revealed: (self: A, a: str, *, b: int = Literal[0]) -> None
A("hi")
```

2
crates/ty_python_semantic/resources/mdtest/dataclasses/fields.md
View file

@ -108,7 +108,7 @@ class A:
name: str = field(init=False)
# field(init=False) should be ignored for dataclass_transform without explicit field_specifiers
reveal_type(A.__init__) # revealed: (self: A, name: str = Unknown) -> None
reveal_type(A.__init__) # revealed: (self: A, name: str) -> None
@dataclass
class B: