[Bug c++/50442] Constructing T from implicit conversion to T& ambiguous in C++0x mode, not C++98

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50442

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-09-17 09:48:55 UTC ---
yep, confirmed that r178552 changed the behaviour