Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: Euterpea-2.0.7 (user goal)
[__1] next goal: bytestring (dependency of Euterpea)
[__1] rejecting: bytestring-0.11.5.2/installed-0.11.5.2 (conflict: Euterpea =>
bytestring>=0.10.4.0 && <=0.10.9)
[__1] skipping: bytestring-0.12.0.2, bytestring-0.12.0.1, bytestring-0.12.0.0,
bytestring-0.11.5.3, bytestring-0.11.5.2, bytestring-0.11.5.1,
bytestring-0.11.5.0, bytestring-0.11.4.0, bytestring-0.11.3.1,
bytestring-0.11.3.0, bytestring-0.11.2.0, bytestring-0.11.1.0,
bytestring-0.11.0.0, bytestring-0.10.12.1, bytestring-0.10.12.0,
bytestring-0.10.10.1, bytestring-0.10.10.0, bytestring-0.10.9.0 (has the same
characteristics that caused the previous version to fail: excluded by
constraint '>=0.10.4.0 && <=0.10.9' from 'Euterpea')
[__1] trying: bytestring-0.10.8.2
[__2] next goal: base (dependency of Euterpea)
[__2] rejecting: base-4.18.1.0/installed-4.18.1.0 (conflict: bytestring =>
base>=4.2 && <4.15)
[__2] skipping: base-4.19.0.0, base-4.18.2.0, base-4.18.1.0, base-4.18.0.0,
base-4.17.2.1, base-4.17.2.0, base-4.17.1.0, base-4.17.0.0, base-4.16.4.0,
base-4.16.3.0, base-4.16.2.0, base-4.16.1.0, base-4.16.0.0, base-4.15.1.0,
base-4.15.0.0 (has the same characteristics that caused the previous version
to fail: excluded by constraint '>=4.2 && <4.15' from 'bytestring')
[__2] rejecting: 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, 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)
[__2] fail (backjumping, conflict set: Euterpea, base, bytestring)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, bytestring, Euterpea