[Bug libstdc++/69222] [5 Regression] C++14 template code working in GCC 5.1 stops working in 5.2 and 5.3

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69222

--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Tue Jan 12 14:55:00 2016
New Revision: 232274

URL: https://gcc.gnu.org/viewcvs?rev=232274&root=gcc&view=rev
Log:
Prevent recursive instantiation in std::function

        PR libstdc++/69005
        PR libstdc++/69222
        * include/std/functional (function::_Invoke): Remove, use result_of.
        (function::_Callable): Replace alias template with class template
        and use partial specialization instead of _NotSelf alias template.
        (function(_Functor)): Add "not self" constraint so that _Callable is
        not used while type is incomplete.
        * testsuite/20_util/function/69222.cc: New.

Added:
    branches/gcc-5-branch/libstdc++-v3/testsuite/20_util/function/69222.cc
Modified:
    branches/gcc-5-branch/libstdc++-v3/ChangeLog
    branches/gcc-5-branch/libstdc++-v3/include/std/functional