[PATCH] D132990: [Clang] Fix compat diagnostic to detect a nontype template parameter has a placeholder type using getContainedAutoType()

[Shafik Yaghmour via Phabricator via cfe-commits]

shafik added inline comments.


================
Comment at: clang/lib/Sema/SemaTemplate.cpp:1534-1538
+  if (TInfo->getType()->getContainedAutoType()) {
     Diag(D.getIdentifierLoc(),
          diag::warn_cxx14_compat_template_nontype_parm_auto_type)
       << QualType(TInfo->getType()->getContainedAutoType(), 0);
   }
----------------
mizvekov wrote:
> I think checking that the deduced type is undeduced was really unnecessary 
> though, as I don't think we update the type source infos after deduction in 
> any case.
I am not sure about the `DeducedTemplateSpecializationType` I was looking at 
the change that brought in that type and it is not clear to me what a good test 
would be. I believe outside of C++17 mode they would be hard errors.  Can you 
provide an example that would work outside of C++17 mode?


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D132990/new/

https://reviews.llvm.org/D132990

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