https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80485
--- Comment #7 from Tony E Lewis <TonyELewis at hotmail dot com> --- Ah yes - I'm seeing it compiling cleanly now on Godbolt's trunk (9.0.0 20180615). Must have been a temporary glitch in the build (and couldn't possibly have been due to my error :P ).