Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: box-socket-0.2.0 (user goal)
[__1] trying: websockets-0.12.7.2 (dependency of box-socket)
[__2] next goal: attoparsec (dependency of websockets)
[__2] rejecting: attoparsec-0.14.1 (conflict: websockets => attoparsec>=0.10
&& <0.14)
[__2] trying: attoparsec-0.13.2.5
[__3] next goal: box (dependency of box-socket)
[__3] rejecting: box-0.7.0 (conflict: attoparsec==0.13.2.5, box =>
attoparsec^>=0.14)
[__3] rejecting: box-0.6.3 (conflict: box-socket => box^>=0.7)
[__3] skipping: box-0.6.2, box-0.6.1, box-0.6.0, box-0.5.0, box-0.4.0,
box-0.3.0, box-0.2.0, box-0.1.0, box-0.0.1.5, box-0.0.1.4, box-0.0.1.2,
box-0.0.1.1 (has the same characteristics that caused the previous version to
fail: excluded by constraint '^>=0.7' from 'box-socket')
[__3] fail (backjumping, conflict set: attoparsec, box, box-socket)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: box-socket, box, attoparsec,
websockets
Try running with --minimize-conflict-set to improve the error message.