Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: schematic-0.5.1.0 (user goal)
[__1] trying: regex-tdfa-text-1.0.0.3 (dependency of schematic)
[__2] next goal: regex-base (dependency of regex-tdfa-text)
[__2] rejecting: regex-base-0.94.0.0 (conflict: regex-tdfa-text =>
regex-base<0.94)
[__2] trying: regex-base-0.93.2
[__3] next goal: base (dependency of schematic)
[__3] rejecting: base-4.14.1.0/installed-4.14.1.0 (conflict: regex-base
+/-newbase +/-splitbase => base<4.13)
[__3] rejecting: 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)
[__3] fail (backjumping, conflict set: base, regex-base, schematic)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, regex-base, schematic,
regex-tdfa-text
Try running with --minimize-conflict-set to improve the error message.