Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: mail-pool-2.2.1 (user goal)
[__1] trying: base-4.14.1.0/installed-4.14.1.0 (dependency of mail-pool)
[__2] next goal: HaskellNet (dependency of mail-pool)
[__2] rejecting: HaskellNet-0.5.1 (conflict: mail-pool => HaskellNet>=0.5.2)
[__2] skipping: HaskellNet-0.5, HaskellNet-0.4.5, HaskellNet-0.4.4,
HaskellNet-0.4.3, HaskellNet-0.4.2, HaskellNet-0.4.1, HaskellNet-0.4,
HaskellNet-0.3.1, HaskellNet-0.3, HaskellNet-0.2.5, HaskellNet-0.2.4,
HaskellNet-0.2.3, HaskellNet-0.2.2, HaskellNet-0.2.1 (has the same
characteristics that caused the previous version to fail: excluded by
constraint '>=0.5.2' from 'mail-pool')
[__2] rejecting: HaskellNet-0.5.2 (conflict:
base==4.14.1.0/installed-4.14.1.0, HaskellNet => base>=4.3 && <4.14)
[__2] fail (backjumping, conflict set: HaskellNet, base, mail-pool)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, mail-pool, HaskellNet