Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: cabal-bounds (user goal)
rejecting: cabal-bounds-1.0.2, 1.0.1, 1.0.0, 0.9.5, 0.9.4, 0.9.3, 0.9.2, 0.9,
0.8.9, 0.8.8, 0.8.7, 0.8.6, 0.8.5, 0.8.4, 0.8.3, 0.8.2, 0.8.1, 0.8, 0.7, 0.6,
0.5, 0.4.1, 0.4, 0.3, 0.2.1, 0.2, 0.1.16, 0.1.15, 0.1.14, 0.1.13, 0.1.12,
0.1.11, 0.1.10, 0.1.9, 0.1.8, 0.1.7, 0.1.6, 0.1.5, 0.1.4, 0.1.3, 0.1.2 (global
constraint requires ==0.9.1)
trying: cabal-bounds-0.9.1
trying: base-4.8.1.0/installed-4f7... (dependency of cabal-bounds-0.9.1)
next goal: either (dependency of cabal-bounds-0.9.1)
rejecting: either-4.4.1, 4.4 (conflict: cabal-bounds => either>=4.1.1 && <4.4)
trying: either-4.3.4.1
trying: bifunctors-5.1 (dependency of either-4.3.4.1)
next goal: lens (dependency of cabal-bounds-0.9.1)
rejecting: lens-4.13, 4.12.3, 4.12.2, 4.12.1, 4.12, 4.11.1, 4.11, 4.10, 4.9.1,
4.9, 4.8 (conflict: cabal-bounds => lens>=4.0.1 && <4.8)
rejecting: lens-4.7.0.1, 4.7, 4.6.0.1, 4.6, 4.5, 4.4.0.2, 4.4.0.1, 4.4, 4.3.3,
4.3.2, 4.3.1, 4.3 (conflict: base==4.8.1.0/installed-4f7..., lens => base>=4.4
&& <4.8)
rejecting: lens-4.2, 4.1.2.1, 4.1.2, 4.1.1 (conflict: bifunctors==5.1, lens =>
bifunctors>=4 && <5)
rejecting: lens-4.1 (conflict: base==4.8.1.0/installed-4f7..., lens => base<0)
rejecting: lens-4.0.7, 4.0.6, 4.0.5 (conflict: bifunctors==5.1, lens =>
bifunctors>=4 && <5)
rejecting: lens-4.0.4, 4.0.3, 4.0.2, 4.0.1 (conflict:
base==4.8.1.0/installed-4f7..., lens => base>=4.3 && <4.7)
rejecting: lens-4.0, 3.10.3, 3.10.2, 3.10.1, 3.10.0.1, 3.10, 3.9.2, 3.9.1,
3.9.0.3, 3.9.0.2, 3.9.0.1, 3.9, 3.8.7.3, 3.8.7.2, 3.8.7.1, 3.8.7, 3.8.6,
3.8.5, 3.8.4, 3.8.3, 3.8.2, 3.8.1, 3.8.0.2, 3.8.0.1, 3.8, 3.7.6, 3.7.5, 3.7.4,
3.7.3, 3.7.2, 3.7.1.2, 3.7.1.1, 3.7.1, 3.7.0.2, 3.7.0.1, 3.7, 3.6.0.4,
3.6.0.3, 3.6.0.2, 3.6.0.1, 3.6, 3.5.1, 3.5, 3.4, 3.3, 3.2, 3.1, 3.0.6, 3.0.5,
3.0.4, 3.0.3, 3.0.2, 3.0.1, 3.0, 2.9, 2.8, 2.7.0.1, 2.7, 2.6.1, 2.6, 2.5,
2.4.0.2, 2.4, 2.3, 2.2, 2.1, 2.0, 1.9.1, 1.9, 1.8, 1.7.1, 1.7, 1.6, 1.5,
1.4.1, 1.4, 1.3.1, 1.3, 1.2, 1.1.1, 1.1, 1.0.3, 1.0.2, 1.0.1, 1.0, 0.9, 0.8,
0.7, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1 (conflict: cabal-bounds => lens>=4.0.1 &&
<4.8)
Backjump limit reached (change with --max-backjumps).