Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: SourceGraph (user goal)
rejecting: SourceGraph-0.7.0.7, 0.7.0.6, 0.7.0.5, 0.7.0.4, 0.7.0.3, 0.7.0.2,
0.7.0.1, 0.7.0.0, 0.6.1.1, 0.6.0.2, 0.6.0.1, 0.6.0.0, 0.5.5.0, 0.5.2.0,
0.5.1.0, 0.5.0.0, 0.3, 0.2 (global constraint requires ==0.1)
trying: SourceGraph-0.1
trying: base-4.8.1.0/installed-4f7... (dependency of SourceGraph-0.1)
next goal: Cabal (dependency of SourceGraph-0.1)
rejecting: Cabal-1.22.4.0/installed-43c..., 1.22.5.0, 1.22.4.0, 1.22.3.0,
1.22.2.0, 1.22.1.1, 1.22.1.0, 1.22.0.0, 1.20.0.3, 1.20.0.2, 1.20.0.1,
1.20.0.0, 1.18.1.6, 1.18.1.5, 1.18.1.4, 1.18.1.3, 1.18.1.2, 1.18.1.1, 1.18.1,
1.18.0, 1.16.0.3, 1.16.0.2, 1.16.0.1, 1.16.0, 1.14.0, 1.12.0, 1.10.2.0,
1.10.1.0, 1.10.0.0, 1.8.0.6, 1.8.0.4, 1.8.0.2, 1.6.0.3, 1.6.0.2, 1.6.0.1
(conflict: SourceGraph => Cabal<1.5)
rejecting: Cabal-1.4.0.2, 1.4.0.1, 1.4.0.0 (conflict: directory =>
filepath==1.4.0.0/installed-8fe..., Cabal => filepath>=1 && <1.2)
trying: Cabal-1.2.4.0
rejecting: Cabal-1.2.4.0:+small_base (conflict:
base==4.8.1.0/installed-4f7..., Cabal-1.2.4.0:small_base => base>=3 && <4.2)
rejecting: Cabal-1.2.4.0:-small_base (conflict:
base==4.8.1.0/installed-4f7..., Cabal-1.2.4.0:small_base => base<3)
Backjump limit reached (change with --max-backjumps).