Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: servant-to-elm-0.4.2.0 (user goal)
[__1] next goal: servant (dependency of servant-to-elm)
[__1] rejecting: servant-0.18.2 (conflict: servant-to-elm => servant>=0.16.0
&& <0.17.0)
[__1] skipping: servant-0.18.1, servant-0.18 (has the same characteristics
that caused the previous version to fail: excluded by constraint '>=0.16.0 &&
<0.17.0' from 'servant-to-elm')
[__1] trying: servant-0.17
[__2] next goal: base (dependency of servant-to-elm)
[__2] rejecting: base-4.14.1.0/installed-4.14.1.0 (conflict: servant =>
base>=4.9 && <4.14)
[__2] skipping: base-4.14.1.0, base-4.14.0.0 (has the same characteristics
that caused the previous version to fail: excluded by constraint '>=4.9 &&
<4.14' from 'servant')
[__2] rejecting: base-4.13.0.0, base-4.12.0.0, base-4.11.1.0, base-4.11.0.0,
base-4.10.1.0, base-4.10.0.0, base-4.9.1.0, base-4.9.0.0, base-4.8.2.0,
base-4.8.1.0, base-4.8.0.0, base-4.7.0.2, base-4.7.0.1, base-4.7.0.0,
base-4.6.0.1, base-4.6.0.0, base-4.5.1.0, base-4.5.0.0, base-4.4.1.0,
base-4.4.0.0, base-4.3.1.0, base-4.3.0.0, base-4.2.0.2, base-4.2.0.1,
base-4.2.0.0, base-4.1.0.0, base-4.0.0.0, base-3.0.3.2, base-3.0.3.1
(constraint from non-upgradeable package requires installed instance)
[__2] fail (backjumping, conflict set: base, servant, servant-to-elm)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: servant, base, servant-to-elm