================
@@ -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;
----------------
ojhunt wrote:
Default smallvector holds 4 (or 8? the size of TemplateArgument is obscured in
a wall of unions and badly named structs :D) so it's fine in practice - It was
more a question of "did you make a conscious choice here, or is it just because
the API doesn't exist atm" :D
https://github.com/llvm/llvm-project/pull/192071
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