Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: edge (user goal)
rejecting: edge-0.9.0.2, 0.9.0.1, 0.8.20, 0.8.18, 0.8.16, 0.8.14, 0.8.12.1
(global constraint requires ==0.8.12)
trying: edge-0.8.12
next goal: random (dependency of edge-0.8.12)
rejecting: random-1.1 (conflict: edge => random>=1.0.1.1 && <1.1)
trying: random-1.0.1.1
trying: time-1.5.0.1/installed-c20... (dependency of random-1.0.1.1)
next goal: containers (dependency of edge-0.8.12)
rejecting: containers-0.5.6.2/installed-2de..., 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 (conflict: edge => containers>=0.4.2.1 && <0.5)
rejecting: containers-0.4.2.1 (conflict: time =>
deepseq==1.4.1.1/installed-8fb..., containers => deepseq>=1.2 && <1.4)
rejecting: containers-0.4.2.0, 0.4.1.0, 0.4.0.0, 0.3.0.0, 0.2.0.1, 0.2.0.0,
0.1.0.1, 0.1.0.0 (conflict: edge => containers>=0.4.2.1 && <0.5)
Backjump limit reached (change with --max-backjumps).