http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53494
--- Comment #17 from Jonathan Wakely <redi at gcc dot gnu.org> 2012-05-29 23:36:02 UTC --- clang version 3.2 (trunk 155804) also rejects it: t.cc:11:18: error: no viable conversion from 'const char [6]' to 'pair'
