Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: bson (user goal)
rejecting: bson-0.3.2.3, bson-0.3.2.2, bson-0.3.2.1, bson-0.3.2, bson-0.3.1,
bson-0.3, bson-0.2.4, bson-0.2.3, bson-0.2.2, bson-0.2.1, bson-0.2.0,
bson-0.1.7, bson-0.1.6, bson-0.1.5, bson-0.1.4, bson-0.1.3, bson-0.1.2,
bson-0.1.1, bson-0.1, bson-0.0.4, bson-0.0.3, bson-0.0.2 (constraint from user
target requires ==0.0.1)
trying: bson-0.0.1
trying: base-4.9.0.0/installed-4.9... (dependency of bson-0.0.1)
next goal: nano-md5 (dependency of bson-0.0.1)
rejecting: nano-md5-0.1.2, nano-md5-0.1.1, nano-md5-0.1 (conflict:
base==4.9.0.0/installed-4.9..., nano-md5 => base>=3 && <4.7 || <3)
Dependency tree exhaustively searched.