Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: snap-core (user goal)
rejecting: snap-core-1.0.1.0, snap-core-1.0.0.0, snap-core-0.9.8.0,
snap-core-0.9.7.2, snap-core-0.9.7.0, snap-core-0.9.6.4, snap-core-0.9.6.3,
snap-core-0.9.6.2, snap-core-0.9.6.1, snap-core-0.9.6.0, snap-core-0.9.5.0,
snap-core-0.9.4.1, snap-core-0.9.4.0, snap-core-0.9.3.1, snap-core-0.9.3,
snap-core-0.9.2.2, snap-core-0.9.2.1, snap-core-0.9.2, snap-core-0.9.0,
snap-core-0.8.1, snap-core-0.8.0.1, snap-core-0.8.0, snap-core-0.7.0.1,
snap-core-0.7, snap-core-0.6.0.1, snap-core-0.6.0, snap-core-0.5.5,
snap-core-0.5.4, snap-core-0.5.3.1, snap-core-0.5.3, snap-core-0.5.2,
snap-core-0.5.1.4, snap-core-0.5.1.3, snap-core-0.5.1.2, snap-core-0.5.1.1,
snap-core-0.5.1, snap-core-0.5.0, snap-core-0.4.3, snap-core-0.4.2,
snap-core-0.4.1, snap-core-0.4.0.2, snap-core-0.4.0.1, snap-core-0.4.0,
snap-core-0.3.1.1 (constraint from user target requires ==0.3.1)
trying: snap-core-0.3.1
next goal: base (dependency of snap-core-0.3.1)
rejecting: base-4.9.0.0/installed-4.9... (conflict: snap-core => base>=4 &&
<4.3)
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.