Resolving dependencies...
Error: cabal: Could not resolve dependencies:
[__0] trying: sockets-0.6.1.1 (user goal)
[__1] trying: primitive-unlifted-2.1.0.0 (dependency of sockets)
[__2] next goal: base (dependency of sockets)
[__2] rejecting: base-4.16.3.0/installed-4.16.3.0 (conflict:
primitive-unlifted => base>=4.17.1.0 && <5)
[__2] rejecting: base-4.18.0.0, 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, 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: base, primitive-unlifted, sockets)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, sockets, primitive-unlifted