Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: servant-event-stream-0.2.1.0 (user goal)
[__1] trying: servant-server-0.18.2 (dependency of servant-event-stream)
[__2] trying: servant-0.18.2 (dependency of servant-server)
[__3] next goal: servant-js (dependency of servant-event-stream)
[__3] rejecting: servant-js-0.9.4.2 (conflict: servant==0.18.2, servant-js =>
servant>=0.15 && <0.18)
[__3] skipping: servant-js-0.9.4.1, servant-js-0.9.4, servant-js-0.9.3.2,
servant-js-0.9.3.1, servant-js-0.9.3, servant-js-0.9.2, servant-js-0.9.1,
servant-js-0.9, servant-js-0.8.1, servant-js-0.8 (has the same characteristics
that caused the previous version to fail: excludes 'servant' version 0.18.2)
[__3] rejecting: servant-js-0.7.1 (conflict: servant-event-stream =>
servant-js>=0.9 && <0.10)
[__3] skipping: servant-js-0.7, servant-js-0.6.1, servant-js-0.6,
servant-js-0.5 (has the same characteristics that caused the previous version
to fail: excluded by constraint '>=0.9 && <0.10' from 'servant-event-stream')
[__3] fail (backjumping, conflict set: servant, servant-event-stream,
servant-js)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: servant-server, servant,
servant-event-stream, base, servant-js
Try running with --minimize-conflict-set to improve the error message.