================
@@ -2105,6 +2105,25 @@ void SubstituteParameterMappings::buildParameterMapping(
SemaRef.MarkUsedTemplateParameters(Args->arguments(),
/*Depth=*/0, OccurringIndices);
}
+
+ // If a parameter is only referenced in a default template argument,
+ // we need to add it to the mapping explicitly.
+ {
+ llvm::SmallVector<TemplateArgument> DefaultArgs;
+ for (unsigned I = TemplateParams->getMinRequiredArguments();
+ I < TemplateParams->size(); I++) {
+ const NamedDecl *Param = TemplateParams->getParam(I);
+ if (Param->isParameterPack())
+ break;
+ const TemplateArgument *Arg =
+ SemaRef.getASTContext().getDefaultTemplateArgumentOrNone(Param);
+ assert(Arg && "expected a default argument");
+ DefaultArgs.emplace_back(std::move(*Arg));
+ }
+ SemaRef.MarkUsedTemplateParameters(DefaultArgs, /*Depth=*/0,
+ OccurringIndices);
----------------
zyn0217 wrote:
That doesn't seem to work, so we added both :(
https://github.com/llvm/llvm-project/pull/192071
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