[Bug ada/62205] GNAT does not accept class types for Default_Iterator

[demoonlit at panathenaia dot halfmoon.jp]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62205

--- Comment #3 from yuta tomino <demoonlit at panathenaia dot halfmoon.jp> ---
It seems fixed with gcc-5-20150405.