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[red-knot] fix ordering of ClassDef semantic index building (#16915)

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## Summary

From #16861

This PR fixes the incorrect `ClassDef` handling of
`SemanticIndexBuilder::visit_stmt`, which fixes some of the incorrect
behavior of referencing the class itself in the class scope (a complete
fix requires a different fix, which will be done in the another PR).

---------

Co-authored-by: Carl Meyer <carl@astral.sh>
This commit is contained in:
Shunsuke Shibayama 2025-03-23 22:23:12 +09:00 • committed by GitHub
parent bb07ccd783
commit ee51c2a389
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2 changed files with 6 additions and 4 deletions
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3
crates/red_knot_python_semantic/resources/mdtest/generics/classes.md
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@ -183,8 +183,9 @@ In a non-stub file, without stringified forward references, this raises a `NameE
```py
class Base[T]: ...
# TODO: error: [unresolved-reference]
# TODO: the unresolved-reference error is correct, the non-subscriptable is not
# error: [non-subscriptable]
# error: [unresolved-reference]
class Sub(Base[Sub]): ...
```

7
crates/red_knot_python_semantic/src/semantic_index/builder.rs
View file

@ -926,9 +926,6 @@ where
self.visit_decorator(decorator);
}
let symbol = self.add_symbol(class.name.id.clone());
self.add_definition(symbol, class);
self.with_type_params(
NodeWithScopeRef::ClassTypeParameters(class),
class.type_params.as_deref(),
@ -943,6 +940,10 @@ where
builder.pop_scope()
},
);
// In Python runtime semantics, a class is registered after its scope is evaluated.
let symbol = self.add_symbol(class.name.id.clone());
self.add_definition(symbol, class);
}
ast::Stmt::TypeAlias(type_alias) => {
let symbol = self.add_symbol(