[PATCH] D21508: Diagnose friend function template redefinitions

[Serge Pavlov via Phabricator via cfe-commits]

sepavloff updated this revision to Diff 138303.
sepavloff added a comment.

Updated patch

- Rebased relative to recent ToT
- Removed the change in `FunctionDecl::getTemplateInstantiationPattern()`, as it is not necessary for error detection,
- Added test for use in module.


Repository:
  rC Clang

https://reviews.llvm.org/D21508

Files:
  include/clang/AST/DeclBase.h
  lib/Sema/SemaDecl.cpp
  lib/Sema/SemaTemplateInstantiateDecl.cpp
  test/Modules/friend-definition.cpp
  test/SemaCXX/friend2.cpp

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