[llvm-bugs] [Bug 37346] New: explicit specialization in class scope compiles instead of failing

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=37346

            Bug ID: 37346
           Summary: explicit specialization in class scope compiles
                    instead of failing
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++
          Assignee: unassignedclangbugs at nondot.org
          Reporter: rhalbersma at gmail.com
                CC: dgregor at apple.com, llvm-bugs at lists.llvm.org

struct S 
{
    template<int N>
    constexpr static auto var = 0;

    template<>
    constexpr static auto var<0> = 1;
};

int main() 
{
    static_assert(S::var<0> == 1);
}

Fails to compile on clang 6.0 (as well as gcc 7.3 and 8.1) with "explicit
specialization of 'var' in class scope" but compiles with clang SVN-trunk (see
https://wandbox.org/permlink/6t2pfHx8CZkejsWh). 

Did the Standard change w.r.t. explicit specializations in class scope, or is
this a regression?

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