Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: pred-trie (user goal)
rejecting: pred-trie-0.2.0, 0.1, 0.0.12, 0.0.11, 0.0.10.2 (global constraint
requires ==0.0.10.1)
trying: pred-trie-0.0.10.1
next goal: base (dependency of pred-trie-0.0.10.1)
rejecting: base-4.7.0.1/installed-e4b... (conflict: pred-trie => base>=4.8 &&
<5)
rejecting: base-4.8.0.0, 4.7.0.2, 4.7.0.1, 4.7.0.0, 4.6.0.1, 4.6.0.0, 4.5.1.0,
4.5.0.0, 4.4.1.0, 4.4.0.0, 4.3.1.0, 4.3.0.0, 4.2.0.2, 4.2.0.1, 4.2.0.0,
4.1.0.0, 4.0.0.0, 3.0.3.2, 3.0.3.1 (global constraint requires installed
instance)
Dependency tree exhaustively searched.