C++ PATCH for c++/59823 (wrong overload resolution)/DR 1138

Jason Merrill jason@redhat.com
Tue Jan 28 04:25:00 GMT 2014

In the original testcase we were failing to prefer the copy assignment 
(which can take the result of the conversion operator directly) to a 
copy constructor followed by move assignment.  The best way to fix this 
was to make the latter ill-formed, as it is supposed to be under DR 
1138: just as you can't bind an rvalue reference to an lvalue variable, 
you can't bind it to the lvalue result of a conversion op either.

Tested x86_64-pc-linux-gnu, applying to trunk.
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