Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: board-games-0.4 (user goal)
[__1] trying: cgi-3001.5.0.0 (dependency of board-games)
[__2] next goal: bytestring (dependency of cgi)
[__2] rejecting: bytestring-0.11.3.1/installed-0.11.3.1 (conflict: cgi =>
bytestring<0.11)
[__2] skipping: 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 (has the same
characteristics that caused the previous version to fail: excluded by
constraint '<0.11' from 'cgi')
[__2] trying: bytestring-0.10.12.1
[__3] next goal: base (dependency of board-games +/-splitbase)
[__3] rejecting: base-4.16.3.0/installed-4.16.3.0 (conflict: bytestring =>
base>=4.2 && <4.16)
[__3] skipping: 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 (has the same characteristics that caused the
previous version to fail: excluded by constraint '>=4.2 && <4.16' from
'bytestring')
[__3] rejecting: base-4.15.1.0, base-4.15.0.0, 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)
[__3] fail (backjumping, conflict set: base, board-games, bytestring)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, cgi, bytestring, board-games
Try running with --minimize-conflict-set to improve the error message.