[PATCH] D56731: Add -Wimplicit-ctad warning to diagnose CTAD on types with no user defined deduction guides.

[Eric Fiselier via Phabricator via cfe-commits]

EricWF created this revision.
EricWF added reviewers: rsmith, james.dennett, gromer.

Some style guides want to allow using CTAD only on types that "opt-in"; i.e. on types that are designed to support it and not just types that *happen* to work with it.

This patch implements the `-Wimplicit-ctad` warning, which is off by default, which warns when CTAD is used on a type that does not define any deduction guides.


Repository:
  rC Clang

https://reviews.llvm.org/D56731

Files:
  include/clang/Basic/DiagnosticGroups.td
  include/clang/Basic/DiagnosticSemaKinds.td
  lib/Sema/SemaInit.cpp
  test/SemaCXX/cxx1z-class-template-argument-deduction.cpp

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