Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: morley-1.15.1 (user goal)
[__1] trying: haskeline-0.8.0.1/installed-0.8.0.1 (dependency of morley)
[__2] trying: base-4.14.1.0/installed-4.14.1.0 (dependency of haskeline)
[__3] next goal: base-noprelude (dependency of morley)
[__3] rejecting: base-noprelude-4.13.0.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.13.0.0)
[__3] rejecting: base-noprelude-4.12.0.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.12.0.0)
[__3] rejecting: base-noprelude-4.11.1.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.11.1.0)
[__3] rejecting: base-noprelude-4.11.0.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.11.0.0)
[__3] rejecting: base-noprelude-4.10.1.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.10.1.0)
[__3] rejecting: base-noprelude-4.10.0.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.10.0.0)
[__3] rejecting: base-noprelude-4.9.1.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.9.1.0)
[__3] rejecting: base-noprelude-4.9.0.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.9.0.0)
[__3] rejecting: base-noprelude-4.8.2.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.8.2.0)
[__3] rejecting: base-noprelude-4.8.1.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.8.1.0)
[__3] rejecting: base-noprelude-4.8.0.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.8.0.0)
[__3] rejecting: base-noprelude-4.7.0.2 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.7.0.2)
[__3] rejecting: base-noprelude-4.7.0.1 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.7.0.1)
[__3] rejecting: base-noprelude-4.7.0.0 (conflict: haskeline =>
base==4.14.1.0/installed-4.14.1.0, base-noprelude => base==4.7.0.0)
[__3] rejecting: base-noprelude-4.6.0.1 (conflict: morley =>
base-noprelude>=4.7 && <5)
[__3] skipping: base-noprelude-4.6.0.0, base-noprelude-4.5.1.0,
base-noprelude-4.5.0.0, base-noprelude-4.3.1.0, base-noprelude-4.3.0.0 (has
the same characteristics that caused the previous version to fail: excluded by
constraint '>=4.7 && <5' from 'morley')
[__3] fail (backjumping, conflict set: base-noprelude, haskeline, morley)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, base-noprelude, morley,
haskeline
Try running with --minimize-conflict-set to improve the error message.