erichkeane added inline comments.

================
Comment at: clang/lib/Sema/SemaTemplateDeduction.cpp:1110
+  //   Ai is ignored;
+  if (PartialOrdering && ArgIdx + 1 == NumArgs &&
+      isa<PackExpansionType>(Args[ArgIdx]))
----------------
aaron.ballman wrote:
> Why are you checking `ArgIdx + 1 == NumArgs` here? It looks like you're only 
> handling the case where the pack is the last argument, but packs can appear 
> anywhere, right?
This is definitely a concern to me as well, we probably have to check ALL packs 
and figure out what was deduced.


================
Comment at: clang/lib/Sema/SemaTemplateDeduction.cpp:5198
+  unsigned NumParams2 = FD2->getNumParams();
+  bool Variadic1 = NumParams1 && FD1->parameters().back()->isParameterPack();
+  bool Variadic2 = NumParams2 && FD2->parameters().back()->isParameterPack();
----------------
This is still the same issue I think?  This should probably be a 'parameters 
contains pack', not just checking the last.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D128745/new/

https://reviews.llvm.org/D128745

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