https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84582

            Bug ID: 84582
           Summary: [8 Regression] Rejected valid C++ code since r257961
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: mpolacek at gcc dot gnu.org
  Target Milestone: ---

It's isolated from Firefox, hope it's a valid code:

$ cat RegExp.ii
template <class> class a {
  static const long b = 0;
  static const unsigned c = (b);
};

$ g++ RegExp.ii
RegExp.ii:3:31: error: non-constant in-class initialization invalid for static
member ‘a< <template-parameter-1-1> >::c’
   static const unsigned c = (b);
                               ^
RegExp.ii:3:31: note: (an out of class initialization is required)

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