Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: happy (user goal)
rejecting: happy-1.19.5, 1.19.4, 1.19.3, 1.19.2, 1.19.1, 1.19.0, 1.18.11,
1.18.10, 1.18.9, 1.18.8, 1.18.7, 1.18.6, 1.18.5, 1.18.4, 1.18.2 (global
constraint requires ==1.18.1)
trying: happy-1.18.1
trying: base-4.7.0.1/installed-e4b... (dependency of happy-1.18.1)
rejecting: happy-1.18.1:+small_base (conflict: base==4.7.0.1/installed-e4b...,
happy-1.18.1:small_base => base>=2.1 && <4.3)
rejecting: happy-1.18.1:-small_base (conflict: base==4.7.0.1/installed-e4b...,
happy-1.18.1:small_base => base>=1.0 && <2.1)
Dependency tree exhaustively searched.