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[ty] Support dataclasses.InitVar (#19527)

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## Summary

I saw that this creates a lot of false positives in the ecosystem, and
it seemed to be relatively easy to add basic support for this.

Some preliminary work on this was done by @InSyncWithFoo — thank you.

part of https://github.com/astral-sh/ty/issues/111

## Ecosystem analysis

The results look good.

## Test Plan

New Markdown tests

---------

Co-authored-by: InSync <insyncwithfoo@gmail.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
This commit is contained in:
David Peter 2025-07-24 16:33:33 +02:00 • committed by GitHub
parent 1079975b35
commit dc6be457b5
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5 changed files with 336 additions and 57 deletions
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7
crates/ty_python_semantic/src/place.rs
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@ -244,7 +244,7 @@ pub(crate) fn class_symbol<'db>(
ConsideredDefinitions::EndOfScope,
);
if !place_and_quals.place.is_unbound() {
if !place_and_quals.place.is_unbound() && !place_and_quals.is_init_var() {
// Trust the declared type if we see a class-level declaration
return place_and_quals;
}
@ -524,6 +524,11 @@ impl<'db> PlaceAndQualifiers<'db> {
self.qualifiers.contains(TypeQualifiers::CLASS_VAR)
}
/// Returns `true` if the place has a `InitVar` type qualifier.
pub(crate) fn is_init_var(&self) -> bool {
self.qualifiers.contains(TypeQualifiers::INIT_VAR)
}
/// Returns `Some(…)` if the place is qualified with `typing.Final` without a specified type.
pub(crate) fn is_bare_final(&self) -> Option<TypeQualifiers> {
match self {