Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: yi-contrib (user goal)
rejecting: yi-contrib-0.10.1, 0.10.0, 0.8.2, 0.8.1, 0.8.0, 0.7.2, 0.7.1,
0.7.0, 0.6.7.0, 0.6.6.0, 0.6.5.0 (global constraint requires ==0.6.4.0)
trying: yi-contrib-0.6.4.0
trying: base-4.8.1.0/installed-4f7... (dependency of yi-contrib-0.6.4.0)
next goal: yi (dependency of yi-contrib-0.6.4.0)
rejecting: yi-0.12.2, 0.12.1, 0.12.0, 0.11.2, 0.11.1, 0.11.0, 0.10.1, 0.10.0,
0.8.2, 0.8.1, 0.8.0, 0.7.2, 0.7.1, 0.7.0, 0.6.7.0, 0.6.6.0, 0.6.5.0 (conflict:
yi-contrib => yi==0.6.4.0)
trying: yi-0.6.4.0
next goal: unordered-containers (dependency of yi-0.6.4.0)
rejecting: unordered-containers-0.2.5.1, 0.2.5.0, 0.2.4.0, 0.2.3.3, 0.2.3.2,
0.2.3.1, 0.2.3.0, 0.2.2.1, 0.2.2.0, 0.2.1.0, 0.2.0.1, 0.2.0.0 (conflict: yi =>
unordered-containers>=0.1.3 && <0.2)
rejecting: unordered-containers-0.1.4.6, 0.1.4.5, 0.1.4.4 (conflict:
base==4.8.1.0/installed-4f7..., unordered-containers => base>=4 && <4.6)
rejecting: unordered-containers-0.1.4.3 (conflict:
base==4.8.1.0/installed-4f7..., unordered-containers => base>=4 && <4.5)
rejecting: unordered-containers-0.1.4.2 (conflict:
base==4.8.1.0/installed-4f7..., unordered-containers => base<4.5)
rejecting: unordered-containers-0.1.4.1, 0.1.4.0, 0.1.3.0 (conflict:
base==4.8.1.0/installed-4f7..., unordered-containers => base<4.4)
rejecting: unordered-containers-0.1.2.0, 0.1.1.0, 0.1.0.0 (conflict: yi =>
unordered-containers>=0.1.3 && <0.2)
Dependency tree exhaustively searched.