Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: happs-tutorial (user goal)
rejecting: happs-tutorial-0.9.5, 0.9.4, 0.9.3, 0.9.2, 0.9.1, 0.9.0, 0.8.1,
0.8, 0.7.1 (global constraint requires ==0.7)
trying: happs-tutorial-0.7
trying: base-4.8.1.0/installed-4f7... (dependency of happs-tutorial-0.7)
next goal: happstack-helpers (dependency of happs-tutorial-0.7)
rejecting: happstack-helpers-0.56, 0.54, 0.53, 0.52, 0.51, 0.50, 0.49, 0.48,
0.47, 0.46, 0.45, 0.44, 0.43, 0.42, 0.30, 0.22.1, 0.22, 0.21, 0.20 (conflict:
happs-tutorial => happstack-helpers>=0.11 && <0.20)
trying: happstack-helpers-0.11
trying: happstack-ixset-6.0.1 (dependency of happstack-helpers-0.11)
trying: happstack-util-6.0.3 (dependency of happstack-ixset-6.0.1)
trying: process-1.2.3.0/installed-f02... (dependency of happstack-util-6.0.3)
next goal: haskell98 (dependency of happstack-helpers-0.11)
rejecting: haskell98-2.0.0.3 (conflict: base==4.8.1.0/installed-4f7...,
haskell98 => base>=4.7 && <4.8)
rejecting: haskell98-2.0.0.2 (conflict: base==4.8.1.0/installed-4f7...,
haskell98 => base==4.6.*)
rejecting: haskell98-2.0.0.1, 2.0.0.0 (conflict: process =>
directory==1.2.2.0/installed-258..., haskell98 => directory>=1.1 && <1.2)
rejecting: haskell98-1.1.0.1, 1.1.0.0, 1.0.1.1 (conflict:
base==4.8.1.0/installed-4f7..., haskell98 => base>=3 && <4.6)
rejecting: haskell98-1.0.1.0 (conflict: base==4.8.1.0/installed-4f7...,
haskell98 => base<4.6)
rejecting: haskell98-1.0 (conflict: base==4.8.1.0/installed-4f7..., haskell98
=> base<4.3)
Backjump limit reached (change with --max-backjumps).