Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: henet (user goal)
rejecting: henet-1.3.9.3, henet-1.3.9.2, henet-1.3.9.1, henet-1.3.9.0
(constraint from user target requires ==1.3.8.1.1)
trying: henet-1.3.8.1.1
trying: base-4.9.0.0/installed-4.9... (dependency of henet-1.3.8.1.1)
next goal: bitset (dependency of henet-1.3.8.1.1)
rejecting: bitset-1.4.8 (conflict: base==4.9.0.0/installed-4.9..., bitset =>
base>=4.4.0 && <4.8)
rejecting: bitset-1.4.7, bitset-1.4.6, bitset-1.4.5, bitset-1.4.4,
bitset-1.4.3, bitset-1.4.2, bitset-1.4.1, bitset-1.4.0 (conflict:
base==4.9.0.0/installed-4.9..., bitset => base>=4.4.0 && <4.7)
rejecting: bitset-1.3.0, bitset-1.2, bitset-1.1, bitset-1.0, bitset-0.6,
bitset-0.5 (conflict: henet => bitset>=1.4.0)
Dependency tree exhaustively searched.