[clang] Assertion `(S.getLangOpts().CPlusPlus11 || CCE == CCEKind::TempArgStrict) && "converted constant expression outside C++11 or TTP matching"' failed

[clang] Assertion `(S.getLangOpts().CPlusPlus11 || CCE == CCEKind::TempArgStrict) && "converted constant expression outside C++11 or TTP matching"' failed #477811