Resolving dependencies...
cabal: Could not resolve dependencies:
trying: runtime-arbitrary-0.1.0.6 (user goal)
trying: base-4.9.0.0/installed-4.9... (dependency of
runtime-arbitrary-0.1.0.6)
next goal: ifcxt (dependency of runtime-arbitrary-0.1.0.6)
rejecting: ifcxt-0.1.1, ifcxt-0.1.0.0 (conflict:
base==4.9.0.0/installed-4.9..., ifcxt => base>=4.8 && <4.9)
Dependency tree exhaustively searched.