Resolving dependencies...
cabal: Could not resolve dependencies:
trying: henet-1.3.9.3 (user goal)
trying: base-4.9.0.0/installed-4.9... (dependency of henet-1.3.9.3)
next goal: bitset (dependency of henet-1.3.9.3)
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 (conflict: base==4.9.0.0/installed-4.9..., bitset =>
base>=4.4.0 && <4.7)
rejecting: 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, bitset-1.3.0, bitset-1.2,
bitset-1.1, bitset-1.0, bitset-0.6, bitset-0.5 (conflict: henet =>
bitset>=1.4.7)
Dependency tree exhaustively searched.