[Bug libstdc++/57263] std::set with user-defined allocator - compile error

[mustrumr97 at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57263

--- Comment #1 from Hristo Venev <mustrumr97 at gmail dot com> ---
Created attachment 30104
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30104&action=edit
A nice and short testcase