================
@@ -4265,6 +4265,19 @@ class LookupVisibleHelper {
const auto *TST = BaseType->getAs<TemplateSpecializationType>();
if (!TST)
continue;
+ // The base may be named through an alias template, whose
+ // TemplateName is a TypeAliasTemplateDecl rather than the
+ // ClassTemplateDecl we are after. Look through the alias, otherwise
+ // the base is skipped entirely. libstdc++'s std::allocator<T> hits
+ // this: it derives from __allocator_base<T>, an alias template for
+ // __new_allocator<T>.
+ while (TST->isTypeAlias()) {
+ const auto *Aliased =
+ TST->getAliasedType()->getAs<TemplateSpecializationType>();
+ if (!Aliased)
+ break;
+ TST = Aliased;
----------------
ckandeler wrote:
Done.
https://github.com/llvm/llvm-project/pull/223713
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