Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: hw-json-demo-1.0.0.0 (user goal)
[__1] next goal: hw-rankselect (dependency of hw-json-demo)
[__1] rejecting: hw-rankselect-0.13.4.1 (conflict: hw-json-demo =>
hw-rankselect>=0.12.0.4 && <0.13)
[__1] skipping: hw-rankselect-0.13.4.0, hw-rankselect-0.13.3.2,
hw-rankselect-0.13.3.1, hw-rankselect-0.13.3.0, hw-rankselect-0.13.2.0,
hw-rankselect-0.13.1.0, hw-rankselect-0.13.0.0 (has the same characteristics
that caused the previous version to fail: excluded by constraint '>=0.12.0.4
&& <0.13' from 'hw-json-demo')
[__1] trying: hw-rankselect-0.12.0.4
[__2] next goal: optparse-applicative (dependency of hw-rankselect)
[__2] rejecting: optparse-applicative-0.17.0.0 (conflict: hw-rankselect =>
optparse-applicative>=0.11 && <0.15)
[__2] skipping: optparse-applicative-0.16.1.0, optparse-applicative-0.16.0.0,
optparse-applicative-0.15.1.0, optparse-applicative-0.15.0.0 (has the same
characteristics that caused the previous version to fail: excluded by
constraint '>=0.11 && <0.15' from 'hw-rankselect')
[__2] trying: optparse-applicative-0.14.3.0
[__3] next goal: process (dependency of optparse-applicative)
[__3] rejecting: process-1.6.9.0/installed-1.6.9.0 (conflict:
optparse-applicative => base>=4 && <4.13, process =>
base==4.14.1.0/installed-4.14.1.0)
[__3] trying: process-1.6.14.0
[__4] next goal: directory (dependency of hw-rankselect)
[__4] rejecting: directory-1.3.6.0/installed-1.3.6.0 (conflict:
optparse-applicative => base>=4 && <4.13, directory =>
base==4.14.1.0/installed-4.14.1.0)
[__4] trying: directory-1.3.7.0
[__5] next goal: base (dependency of hw-json-demo)
[__5] rejecting: base-4.14.1.0/installed-4.14.1.0 (conflict:
optparse-applicative => base>=4 && <4.13)
[__5] skipping: base-4.16.1.0, base-4.16.0.0, 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 (has
the same characteristics that caused the previous version to fail: excluded by
constraint '>=4 && <4.13' from 'optparse-applicative')
[__5] rejecting: 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: base, hw-json-demo,
optparse-applicative)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: process, hw-rankselect,
optparse-applicative, directory, base, hw-json-demo
Try running with --minimize-conflict-set to improve the error message.