[Bug c++/53931] [C++11] braced function style cast to reference should be prvalue

[hstong at ca dot ibm.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53931

--- Comment #2 from Hubert Tong <hstong at ca dot ibm.com> ---
Needs a resolution for CWG 1521.