[Bug c++/59838] [4.7/4.8/4.9 Regression] ICE with an enum using an incomplete type

[mpolacek at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59838

--- Comment #8 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
A few bytes shorter testcase

enum E { a, b = (E) a };