Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: bits (user goal)
rejecting: bits-0.4, 0.3.3, 0.3.2, 0.3.1, 0.3, 0.2.1 (global constraint
requires ==0.2)
trying: bits-0.2
next goal: transformers (dependency of bits-0.2)
rejecting: transformers-0.4.2.0/installed-21d..., 0.4.3.0, 0.4.2.0, 0.4.1.0
(conflict: bits => transformers>=0.2 && <0.4)
trying: transformers-0.3.0.0
trying: bytes-0.15.0.1 (dependency of bits-0.2)
trying: transformers-compat-0.4.0.4 (dependency of bytes-0.15.0.1)
trying: transformers-compat-0.4.0.4:-two
rejecting: transformers-compat-0.4.0.4:-three (conflict:
transformers==0.3.0.0, transformers-compat-0.4.0.4:three =>
transformers>=0.4.1 && <0.5)
rejecting: transformers-compat-0.4.0.4:+three (manual flag can only be changed
explicitly)
Dependency tree exhaustively searched.