http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50870
--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> 2011-10-28 15:53:39 UTC --- (In reply to comment #4) > HJ, any chance you can figure out when we regressed for testcase in Comment #3 > ? I tried different versions of GCC, I got pr50870.cc:8: error: expected type-specifier before ‘decltype’ pr50870.cc:8: error: expected `>' before ‘decltype’ pr50870.cc:12: error: template argument 4 is invalid pr50870.cc:12: error: invalid type in declaration before ‘;’ token