Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: co-feldspar-0.1.0.1 (user goal)
[__1] next goal: signals (dependency of co-feldspar)
[__1] rejecting: signals-0.2.0.2 (conflict: co-feldspar => signals>=0.2.1)
[__1] skipping: signals-0.2.0.1, signals-0.0.0.1 (has the same characteristics
that caused the previous version to fail: excluded by constraint '>=0.2.1'
from 'co-feldspar')
[__1] fail (backjumping, conflict set: co-feldspar, signals)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: co-feldspar, signals