Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: hoogle (user goal)
rejecting: hoogle-4.2.43, 4.2.42, 4.2.41, 4.2.40, 4.2.39, 4.2.38, 4.2.37,
4.2.36, 4.2.35, 4.2.34, 4.2.33, 4.2.32, 4.2.31, 4.2.30, 4.2.29, 4.2.28,
4.2.27, 4.2.26, 4.2.25, 4.2.24, 4.2.23, 4.2.22, 4.2.21, 4.2.20, 4.2.19,
4.2.18, 4.2.17, 4.2.16, 4.2.15, 4.2.14, 4.2.13, 4.2.12, 4.2.11, 4.2.10, 4.2.9,
4.2.8, 4.2.7, 4.2.6, 4.2.5, 4.2.4, 4.2.3, 4.2.2, 4.2.1, 4.2, 4.1.5, 4.1.4,
4.1.3, 4.1.2, 4.1.1, 4.1, 4.0.7 (global constraint requires ==4.0.6)
trying: hoogle-4.0.6
trying: base-4.8.1.0/installed-4f7... (dependency of hoogle-4.0.6)
rejecting: hoogle-4.0.6:+splitbase (conflict: base==4.8.1.0/installed-4f7...,
hoogle-4.0.6:splitbase => base>=3 && <4)
rejecting: hoogle-4.0.6:-splitbase (conflict: base==4.8.1.0/installed-4f7...,
hoogle-4.0.6:splitbase => base>=2 && <3)
Dependency tree exhaustively searched.