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Fix symbol table sub_table desync for non-simple annotation targets #7300

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Merged
youknowone merged 3 commits into from
Mar 2, 2026
Merged

Fix symbol table sub_table desync for non-simple annotation targets #7300

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3ecdd0c
Fix symbol table sub_table desync for non-simple annotation targets
youknowone Mar 1, 2026
8b61e74
Validate forbidden expressions in non-simple annotation targets
youknowone Mar 2, 2026
8bd6e97
Restore in_annotation flag before propagating error
youknowone Mar 2, 2026
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1 change: 0 additions & 1 deletion Lib/test/test_type_annotations.py
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Original file line number Diff line number Diff line change
Expand Up @@ -776,7 +776,6 @@ def test_non_name_annotations(self):

class RegressionTests(unittest.TestCase):
# gh-132479
@unittest.expectedFailure # TODO: RUSTPYTHON; SyntaxError: the symbol 'unique_name_6' must be present in the symbol table
def test_complex_comprehension_inlining(self):
# Test that the various repro cases from the issue don't crash
cases = [
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22 changes: 21 additions & 1 deletion crates/codegen/src/symboltable.rs
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Expand Up @@ -1053,6 +1053,11 @@ impl SymbolTableBuilder {
/// Annotation and TypeParams scopes act as async barriers (always non-async).
/// Comprehension scopes are transparent (inherit parent's async context).
fn is_in_async_context(&self) -> bool {
// Annotations are evaluated in a non-async scope even when
// the enclosing function is async.
if self.in_annotation {
return false;
}
for table in self.tables.iter().rev() {
match table.typ {
CompilerScope::AsyncFunction => return true,
Expand Down Expand Up @@ -1462,7 +1467,22 @@ impl SymbolTableBuilder {
self.scan_expression(target, ExpressionContext::Store)?;
}
}
self.scan_annotation(annotation)?;
// Only scan annotation in annotation scope for simple name targets.
// Non-simple annotations (subscript, attribute, parenthesized) are
// never compiled into __annotate__, so scanning them would create
// sub_tables that cause mismatch in the annotation scope's sub_table index.
let is_simple_name = *simple && matches!(&**target, Expr::Name(_));
if is_simple_name {
self.scan_annotation(annotation)?;
} else {
// Still validate annotation for forbidden expressions
// (yield, await, named) even for non-simple targets.
let was_in_annotation = self.in_annotation;
self.in_annotation = true;
let result = self.scan_expression(annotation, ExpressionContext::Load);
self.in_annotation = was_in_annotation;
result?;
}
if let Some(value) = value {
self.scan_expression(value, ExpressionContext::Load)?;
}
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