Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: ghc-events (user goal)
rejecting: ghc-events-0.4.4.0, 0.4.3.0, 0.4.2.0, 0.4.0.1, 0.4.0.0, 0.3.0.1,
0.2.0.1, 0.2, 0.1.0.2, 0.1.0.1, 0.1 (global constraint requires ==0.0.1)
trying: ghc-events-0.0.1
trying: base-4.7.0.1/installed-e4b... (dependency of ghc-events-0.0.1)
next goal: containers (dependency of ghc-events-0.0.1)
rejecting: containers-0.5.5.1/installed-23e..., 0.5.6.3, 0.5.6.2, 0.5.6.1,
0.5.6.0, 0.5.5.1, 0.5.5.0, 0.5.4.0, 0.5.3.1, 0.5.3.0, 0.5.2.1, 0.5.2.0,
0.5.1.0, 0.5.0.0, 0.4.2.1, 0.4.2.0, 0.4.1.0, 0.4.0.0, 0.3.0.0 (conflict:
ghc-events => containers==0.2.*)
rejecting: containers-0.2.0.1, 0.2.0.0 (conflict:
base==4.7.0.1/installed-e4b..., containers => base<4.7)
rejecting: containers-0.1.0.1, 0.1.0.0 (conflict: ghc-events =>
containers==0.2.*)
Dependency tree exhaustively searched.