On 06/09/16 09:00 +0300, Ville Voutilainen wrote:
   PR libstdc++/77288
   * include/std/optional (__is_optional_impl, __is_optional): Remove.
   (__converts_from_optional, __assigns_from_optional): New.
   (optional(_Up&&)): Use is_same instead of __is_optional.
   (optional(const optional<_Up>&)): Constrain with
   __converts_from_optional.
   (optional(optional<_Up>&&)): Likewise.
   (operator=(_Up&&)): Use is_same instead of __is_optional, check
   is_same and is_scalar.
   (operator=(const optional<_Up>&)): Constrain with
   __converts_from_optional and __assigns_from_optional.
   (operator=(optional<_Up>&&)): Likewise.
   * testsuite/20_util/optional/77288.cc: New.
   * testsuite/20_util/optional/cons/value.cc: Adjust.


OK for trunk, thanks.

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