[Bug c++/72799] [C++11] ref-qualifiers are dropped from some function types

["aoliva at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72799

--- Comment #1 from Alexandre Oliva <aoliva at gcc dot gnu.org> ---
Uhh, sorry, I pasted the error messages from a compiler with changes that
attempted to fix the problem.  Here's what gcc version 5.3.1 20160406 (Red Hat
5.3.1-6) (GCC) reports:
/l/tmp/build/gcc/trunk/gcc/testsuite/g++.dg/other/refqual-1.C:15:12: error:
prototype for ‘void (S::* S::mfpmf() &&)() const &’ does not match any in class
‘S’
 void (S::* S::mfpmf(void) &&)(void) const & { return &S::mf; } // ... here...
            ^
/l/tmp/build/gcc/trunk/gcc/testsuite/g++.dg/other/refqual-1.C:10:12: error:
candidate is: void (S::* S::mfpmf() &&)() const
   rqft S::*mfpmf(void) &&;
            ^
/l/tmp/build/gcc/trunk/gcc/testsuite/g++.dg/other/refqual-1.C:23:18: error:
cannot convert ‘void (S::*)() const &’ to ‘pmft2 {aka void (S::*)() const}’ in
initialization
 pmft2 pmf2 = &S::mf;
                  ^