Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: sifflet (user goal)
rejecting: sifflet-2.2.1, 2.2.0, 2.1.0, 2.0.0.0, 1.2.5.1, 1.2.5, 1.2.4, 1.2.3,
1.2.2, 1.2.1, 1.2, 1.1, 1.0, 0.1.7 (global constraint requires ==0.1.6)
trying: sifflet-0.1.6
trying: base-4.8.1.0/installed-4f7... (dependency of sifflet-0.1.6)
next goal: hxt (dependency of sifflet-0.1.6)
rejecting: hxt-9.3.1.15, 9.3.1.14, 9.3.1.13, 9.3.1.12, 9.3.1.11, 9.3.1.10,
9.3.1.9, 9.3.1.7, 9.3.1.6, 9.3.1.4, 9.3.1.3, 9.3.1.2, 9.3.1.1, 9.3.1.0,
9.3.0.1, 9.3.1.5, 9.2.2, 9.2.1, 9.2.0, 9.1.6, 9.1.5, 9.1.4, 9.1.3, 9.1.2,
9.1.1, 9.1.0, 9.0.1, 9.0.0 (conflict: sifflet => hxt>=8.3 && <9)
trying: hxt-8.5.4
next goal: tagsoup (dependency of hxt-8.5.4)
rejecting: tagsoup-0.13.5, 0.13.4, 0.13.3, 0.13.2, 0.13.1, 0.13, 0.12.8,
0.12.7, 0.12.6, 0.12.5, 0.12.4, 0.12.3, 0.12.2, 0.12.1, 0.12, 0.11.1, 0.11
(conflict: hxt => tagsoup>=0.10 && <0.11)
rejecting: tagsoup-0.10.1, 0.10 (conflict: base==4.8.1.0/installed-4f7...,
tagsoup => base>=4 && <4.4)
rejecting: tagsoup-0.9, 0.8, 0.6, 0.4, 0.1 (conflict: hxt => tagsoup>=0.10 &&
<0.11)
Dependency tree exhaustively searched.