[Bug libstdc++/51185] [C++0x] false-positive results of std::is_constructible

[daniel.kruegler at googlemail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51185

--- Comment #2 from Daniel Krügler <daniel.kruegler at googlemail dot com> 2011-11-17 10:58:09 UTC ---
(In reply to comment #1)
The root of the problem is that __is_base_to_derived_ref works on source
references solely. I need a bit time for a proper fix.