================
@@ -634,7 +634,7 @@ struct ConvertConstructorToDeductionGuideTransform {
// Find all template parameters that appear in the given DeducedArgs.
// Return the indices of the template parameters in the TemplateParams.
-SmallVector<unsigned> TemplateParamsReferencedInTemplateArgumentList(
+llvm::SmallSet<unsigned, 8> TemplateParamsReferencedInTemplateArgumentList(
----------------
hokein wrote:
The returned vector is a sorted indices of the referenced template parameters,
and the call site implicitly [depends
on](https://github.com/llvm/llvm-project/blob/main/clang/lib/Sema/SemaTemplateDeductionGuide.cpp#L1050-L1051)
this order. Changing it could disrupt the indexing of transformed template
parameters.
How about keeping it unchanged and creating a SmallSet based on the return
result for your use case?
https://github.com/llvm/llvm-project/pull/98788
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