[Bug libstdc++/52114] SFINAE out the rvalue iostream operators to give better error messages

["paolo.carlini at oracle dot com" <gcc-bugzilla at gcc dot gnu dot org>]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52114

Paolo Carlini <paolo.carlini at oracle dot com> changed:

           What    |Removed                     |Added
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                 CC|                            |daniel.kruegler at
                   |                            |googlemail dot com

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-02-04 20:32:31 UTC ---
Indeed and easy to do.

Yesterday I was wondering: is there something in C++11 saying explicitly that
these tricks are allowed, or some sort of blanket statement explaining how the 
return type specifications are meant to be read? Adding Daniel in CC.