[llvm-bugs] [Bug 47369] New: No compiler error when having an invalid definition in friend declaration

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=47369

            Bug ID: 47369
           Summary: No compiler error when having an invalid definition in
                    friend declaration
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++17
          Assignee: unassignedclangbugs at nondot.org
          Reporter: anders.granlund.0 at gmail.com
                CC: blitzrakete at gmail.com, erik.pilkington at gmail.com,
                    llvm-bugs at lists.llvm.org, richard-llvm at metafoo.co.uk

Program (main.cpp):

  template<typename T>
  void f()
  {
  }

  class C
  {
      friend void f<int>()
      {
      }
  };

  int main()
  {
  }

Compilation command line:

  clang++ -std=c++17 -pedantic-errors main.cpp

Observed behaviour:

  No compilation errors.

Expected behaviour:

  Compilation error about the definition in the friend declaration being
invalid.

Note:

  g++ gives the expected error message.

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