[Bug c++/54126] ICE on constexpr move ctor with const ref type instead of error

[freddie_chopin at op dot pl]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54126

--- Comment #4 from Freddie Chopin <freddie_chopin at op dot pl> 2013-02-13 07:29:23 UTC ---
Created attachment 29430
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=29430
simple fail case

I think I have an even simplier test case, I guess it's the same problem (at
least the ICE message matches). I also think that bug 51707 is actually the
same problem.