Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: acts-0.3.1.1 (user goal)
[__1] trying: acts:+finitary
[__2] trying: finitary-2.1.1.1 (dependency of acts +finitary)
[__3] trying: finitary:+vector
[__4] trying: typelits-witnesses-0.4.0.0 (dependency of finitary +vector)
[__5] next goal: base (dependency of acts)
[__5] rejecting: base-4.16.3.0/installed-4.16.3.0 (conflict:
typelits-witnesses => base>=4.10 && <4.16)
[__5] skipping: base-4.17.0.0, base-4.16.4.0, base-4.16.3.0, base-4.16.2.0,
base-4.16.1.0, base-4.16.0.0 (has the same characteristics that caused the
previous version to fail: excluded by constraint '>=4.10 && <4.16' from
'typelits-witnesses')
[__5] rejecting: base-4.15.1.0, base-4.15.0.0, base-4.14.3.0, base-4.14.2.0,
base-4.14.1.0, base-4.14.0.0, 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)
[__5] fail (backjumping, conflict set: acts, base, typelits-witnesses)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, typelits-witnesses, finitary,
acts, finitary:vector, acts:finitary
Try running with --minimize-conflict-set to improve the error message.