[Bug libstdc++/63942] New: [5.0 Regression] constexpr conflicts with previous declaration

["dje at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63942

            Bug ID: 63942
           Summary: [5.0 Regression] constexpr conflicts with previous
                    declaration
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: dje at gcc dot gnu.org

FAIL: 20_util/tuple/comparison_operators/overloaded.cc (test for excess errors)
Excess errors:
/tmp/20141104/powerpc-ibm-aix7.1.0.0/libstdc++-v3/include/tuple:102:12:
error: 'constexpr std::_Head_base<_Idx, _Head,
false>::_Head_base(const std::_Head_base<_Idx, _Head, false>&) [with
long unsigned int _Idx = 0ul; _Head = std::nullptr_t]' conflicts with
a previous declaration
/tmp/20141104/powerpc-ibm-aix7.1.0.0/libstdc++-v3/include/tuple:102:12:
error: 'constexpr std::_Head_base<_Idx, _Head,
false>::_Head_base(const std::_Head_base<_Idx, _Head, false>&) [with
long unsigned int _Idx = 0ul; _Head = std::nullptr_t]' conflicts with
a previous declaration

FAIL: 20_util/tuple/creation_functions/tuple_cat.cc (test for excess errors)
Excess errors:
/tmp/20141104/powerpc-ibm-aix7.1.0.0/libstdc++-v3/include/tuple:102:12:
error: 'constexpr std::_Head_base<_Idx, _Head,
false>::_Head_base(const std::_Head_base<_Idx, _Head, false>&) [with
long unsigned int _Idx = 6ul; _Head = std::nullptr_t]' conflicts with
a previous declaration
/tmp/20141104/powerpc-ibm-aix7.1.0.0/libstdc++-v3/include/tuple:102:12:
error: 'constexpr std::_Head_base<_Idx, _Head,
false>::_Head_base(const std::_Head_base<_Idx, _Head, false>&) [with
long unsigned int _Idx = 6ul; _Head = std::nullptr_t]' conflicts with
a previous declaration