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don't track self

This commit is contained in:
Douglas Creager 2025-12-10 14:32:40 -05:00
parent e2c9a07745
commit 3572c85434
1 changed files with 11 additions and 2 deletions
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13
crates/ty_python_semantic/src/types/call/bind.rs
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@ -3029,9 +3029,15 @@ impl<'a, 'db> ArgumentTypeChecker<'a, 'db> {
};
let parameters = self.signature.parameters();
for (argument_index, adjusted_argument_index, _, argument_type) in
for (argument_index, adjusted_argument_index, argument, argument_type) in
self.enumerate_argument_types()
{
// Synthetic arguments (e.g., implicit `self`/`cls`) are not provided by the caller.
// Counting their types when computing variance would incorrectly block literal
// promotion (they often carry the class typevars in invariant position), so we ignore
// them for argument variance tracking.
let record_variance = !matches!(argument, Argument::Synthetic);
for (parameter_index, variadic_argument_type) in
self.argument_matches[argument_index].iter()
{
@ -3040,7 +3046,10 @@ impl<'a, 'db> ArgumentTypeChecker<'a, 'db> {
continue;
};
if parameter.form == ParameterForm::Value && expected_type.has_typevar(self.db) {
if record_variance
&& parameter.form == ParameterForm::Value
&& expected_type.has_typevar(self.db)
{
for (identity, typevar) in generic_variables.iter().copied() {
if !typevar.is_inferable(self.db, self.inferable_typevars) {
continue;