re PR libstdc++/66338 (std::forward_as_tuple() issue with single argument)
2016-05-24 Ville Voutilainen <ville.voutilainen@gmail.com>
PR libstdc++/66338
* include/std/tuple (_TMC): Add a check for _NotSameTuple.
* include/std/tuple (tuple(_UElements&&...)): Remove the separate
check for _NotSameTuple.
* include/std/tuple (_TMCT): New.
* include/std/tuple (tuple(const tuple<_UElements...>&)): Use it.
* include/std/tuple (tuple(tuple<_UElements...>&&)): Likewise.
* include/std/tuple (tuple(allocator_arg_t, const _Alloc&,
const tuple<_UElements...>&)): Likewise.
* include/std/tuple (tuple(allocator_arg_t, const _Alloc&,
tuple<_UElements...>&&)): Likewise.
* testsuite/20_util/tuple/cons/66338.cc: New.
From-SVN: r236822