Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: tomlcheck (user goal)
[__0] rejecting: tomlcheck-0.1.0.40, tomlcheck-0.1.0.39, tomlcheck-0.1.0.38,
tomlcheck-0.1.0.36, tomlcheck-0.1.0.29 (constraint from user target requires
==0.1.0.23)
[__0] trying: tomlcheck-0.1.0.23
[__1] trying: megaparsec-9.0.1 (dependency of tomlcheck)
[__2] next goal: htoml-megaparsec (dependency of tomlcheck)
[__2] rejecting: htoml-megaparsec-2.1.0.4 (conflict: tomlcheck =>
htoml-megaparsec>=1.0.1.11 && <2.1.0.0)
[__2] skipping: htoml-megaparsec-2.1.0.3, htoml-megaparsec-2.1.0.2,
htoml-megaparsec-2.1.0.1, htoml-megaparsec-2.1.0.0 (has the same
characteristics that caused the previous version to fail: excluded by
constraint '>=1.0.1.11 && <2.1.0.0' from 'tomlcheck')
[__2] rejecting: htoml-megaparsec-2.0.0.2 (conflict: megaparsec==9.0.1,
htoml-megaparsec => megaparsec>=6.0.0 && <7.0.0)
[__2] skipping: htoml-megaparsec-2.0.0.1, htoml-megaparsec-2.0.0.0,
htoml-megaparsec-1.2.0.2, htoml-megaparsec-1.2.0.1, htoml-megaparsec-1.1.0.4,
htoml-megaparsec-1.1.0.3, htoml-megaparsec-1.1.0.2, htoml-megaparsec-1.1.0.1,
htoml-megaparsec-1.1.0.0, htoml-megaparsec-1.0.1.12,
htoml-megaparsec-1.0.1.11, htoml-megaparsec-1.0.1.10,
htoml-megaparsec-1.0.1.9, htoml-megaparsec-1.0.1.8, htoml-megaparsec-1.0.1.7,
htoml-megaparsec-1.0.1.6, htoml-megaparsec-1.0.1.5, htoml-megaparsec-1.0.1.4,
htoml-megaparsec-1.0.1.3, htoml-megaparsec-1.0.1.2, htoml-megaparsec-1.0.1.1,
htoml-megaparsec-1.0.1.0, htoml-megaparsec-1.0.0.4 (has the same
characteristics that caused the previous version to fail: excludes
'megaparsec' version 9.0.1)
[__2] fail (backjumping, conflict set: htoml-megaparsec, megaparsec,
tomlcheck)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: megaparsec, base, htoml-megaparsec,
tomlcheck
Try running with --minimize-conflict-set to improve the error message.