[Bug c++/60852] [4.8/4.9/4.10 Regression] boost::has_complement of enum class does not compile

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60852

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I don't know if it's valid, but the discrepancy noted in comment 7 is probably
relevant, one way or another