Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: lentil (user goal)
[__0] rejecting: lentil-1.5.1.0, lentil-1.5.0.0, lentil-1.4.1.0,
lentil-1.4.0.0, lentil-1.3.2.0, lentil-1.3.1.0, lentil-1.3.0.0,
lentil-1.2.3.0, lentil-1.2.2.0, lentil-1.2.1.0, lentil-1.2.0.0,
lentil-1.1.2.0, lentil-1.1.1.1, lentil-1.1.0.1, lentil-1.0.11.4 (constraint
from user target requires ==1.0.11.3)
[__0] trying: lentil-1.0.11.3
[__1] next goal: regex-tdfa (dependency of lentil)
[__1] rejecting: regex-tdfa-1.3.1.0 (conflict: lentil => regex-tdfa==1.2.*)
[__1] skipping: regex-tdfa-1.3.0 (has the same characteristics that caused the
previous version to fail: excluded by constraint '==1.2.*' from 'lentil')
[__1] trying: regex-tdfa-1.2.3.2
[__2] next goal: regex-base (dependency of regex-tdfa)
[__2] rejecting: regex-base-0.94.0.1 (conflict: regex-tdfa =>
regex-base>=0.93.1 && <0.94)
[__2] skipping: regex-base-0.94.0.0 (has the same characteristics that caused
the previous version to fail: excluded by constraint '>=0.93.1 && <0.94' from
'regex-tdfa')
[__2] trying: regex-base-0.93.2
[__3] next goal: base (dependency of lentil)
[__3] rejecting: base-4.14.1.0/installed-4.14.1.0 (conflict: regex-base
+/-newbase +/-splitbase => base<4.13)
[__3] rejecting: base-4.15.0.0, 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)
[__3] fail (backjumping, conflict set: base, lentil, regex-base)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, regex-tdfa, lentil, regex-base
Try running with --minimize-conflict-set to improve the error message.