[Bug libstdc++/57270] New: std::is_function ignores function ref-qualifiers

[lucdanton at free dot fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57270

            Bug ID: 57270
           Summary: std::is_function ignores function ref-qualifiers
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: libstdc++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: lucdanton at free dot fr

Following the resolution of 57253
(http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57253) it seems worthwhile to
point out that there are missing specializations of std::function such that
e.g.

    static_assert( std::is_function<void()&>(), "" );

is triggered.