Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: equational-reasoning (user goal)
rejecting: equational-reasoning-0.4.1.1, equational-reasoning-0.4.0.0,
equational-reasoning-0.3.0.0, equational-reasoning-0.2.0.7,
equational-reasoning-0.2.0.6, equational-reasoning-0.2.0.5,
equational-reasoning-0.2.0.4, equational-reasoning-0.2.0.3,
equational-reasoning-0.2.0.2, equational-reasoning-0.2.0.0,
equational-reasoning-0.1.0.0, equational-reasoning-0.0.4.1 (constraint from
user target requires ==0.0.4.0)
trying: equational-reasoning-0.0.4.0
next goal: base (dependency of equational-reasoning-0.0.4.0)
rejecting: base-4.9.0.0/installed-4.9... (conflict: equational-reasoning =>
base==4.6.*)
rejecting: base-4.9.0.0, base-4.8.2.0, base-4.8.1.0, base-4.8.0.0,
base-4.7.0.2, base-4.7.0.1, base-4.7.0.0, base-4.6.0.1, base-4.6.0.0,
base-4.5.1.0, base-4.5.0.0, base-4.4.1.0, base-4.4.0.0, base-4.3.1.0,
base-4.3.0.0, base-4.2.0.2, base-4.2.0.1, base-4.2.0.0, base-4.1.0.0,
base-4.0.0.0, base-3.0.3.2, base-3.0.3.1 (constraint from non-upgradeable
package requires installed instance)
Dependency tree exhaustively searched.