Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: freckle-app-1.0.0.4 (user goal)
[__1] trying: doctest-0.18.1 (dependency of freckle-app)
[__2] next goal: ghc (dependency of doctest)
[__2] rejecting: ghc-8.10.2/installed-8.10.2 (conflict: freckle-app =>
bytestring>=0.10.12.0, ghc => bytestring==0.10.10.0/installed-0.10.10.0)
[__2] trying: ghc-8.10.2
[__3] trying: ghc:-buildable
[__4] next goal: base (dependency of freckle-app)
[__4] rejecting: base-4.14.1.0/installed-4.14.1.0 (conflict: ghc -buildable =>
base<0)
[__4] rejecting: 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)
[__4] fail (backjumping, conflict set: base, freckle-app, ghc, ghc:buildable)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, ghc, ghc:buildable, doctest,
freckle-app
Try running with --minimize-conflict-set to improve the error message.