Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: prologue (user goal)
[__0] rejecting: prologue-3.2.6, prologue-3.2.4, prologue-3.2.3,
prologue-3.2.2, prologue-3.2.1, prologue-3.2.0, prologue-3.1.7,
prologue-3.1.6, prologue-3.1.5, prologue-3.1.4, prologue-3.1.3, prologue-3.1.2
(constraint from user target requires ==3.1.1)
[__0] trying: prologue-3.1.1
[__1] next goal: base (dependency of prologue)
[__1] rejecting: base-4.14.1.0/installed-4.14.1.0 (conflict: prologue =>
base>=4.10 && <4.12)
[__1] skipping: 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 (has the same characteristics that caused the previous version
to fail: excluded by constraint '>=4.10 && <4.12' from 'prologue')
[__1] rejecting: 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)
[__1] fail (backjumping, conflict set: base, prologue)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, prologue