Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: hpaco (user goal)
rejecting: hpaco-0.28.0.5, 0.28.0.4, 0.28.0.3, 0.28.0.2, 0.28.0.1, 0.28.0.0
(global constraint requires ==0.26.0.0)
trying: hpaco-0.26.0.0
trying: aeson-0.10.0.0 (dependency of hpaco-0.26.0.0)
trying: transformers-0.4.2.0/installed-21d... (dependency of aeson-0.10.0.0)
next goal: cmdargs (dependency of hpaco-0.26.0.0)
rejecting: cmdargs-0.10.13, 0.10.12, 0.10.11, 0.10.10, 0.10.9, 0.10.8, 0.10.7,
0.10.6, 0.10.5, 0.10.4, 0.10.3, 0.10.2, 0.10.1, 0.10 (conflict: hpaco =>
cmdargs>=0.9 && <0.10)
rejecting: cmdargs-0.9.7, 0.9.6, 0.9.5, 0.9.4 (conflict:
transformers==0.4.2.0/installed-21d..., cmdargs => transformers>=0.2 && <0.4)
rejecting: cmdargs-0.9.3, 0.9.2, 0.9.1, 0.9 (conflict:
transformers==0.4.2.0/installed-21d..., cmdargs => transformers==0.2.*)
rejecting: cmdargs-0.8, 0.7, 0.6.10, 0.6.9, 0.6.8, 0.6.7, 0.6.6, 0.6.5, 0.6.4,
0.6.3, 0.6.2, 0.6.1, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1 (conflict: hpaco =>
cmdargs>=0.9 && <0.10)
Backjump limit reached (change with --max-backjumps).