https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61753
--- Comment #4 from shapero at uw dot edu --- (In reply to Jonathan Wakely from comment #3) > I don't know how you got that to compile with GCC 4.6.3 as every version I > have rejects it - not a regression. > > (The upstream code on github has been fixed now btw) Thanks for getting to this so quickly! My C++ is spotty, so I didn't recognize that the syntax was invalid. I figured the fact that it compiled on clang meant that it was a problem with GCC and not the code itself.