Created attachment 452314 [details] build log It happens when all IUSE are enabled. Can you reproduce?
Created attachment 452316 [details] build log another failure with USE="* -imgs"
Yeah, I didn't get to backporting quickfuzz to ghc-7.10. Luckily ghc-8.0.2 is now in ~arch as: https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=f00e5e7c8c577f25ccae203241d96eb7f4db4e51 Should work fine. Thank for the report!