Resolving dependencies...
cabal: Could not resolve dependencies:
trying: base-4.9.0.0/installed-4.9... (dependency of
recursion-schemes-1.8.0.2)
next goal: free (dependency of recursion-schemes-1.8.0.2)
rejecting: free-4.12.4, free-4.12.3, free-4.12.2, free-4.12.1, free-4.12,
free-4.11, free-4.10.0.1, free-4.9, free-4.8.0.1, free-4.8, free-4.7.1,
free-4.7, free-4.6.1, free-4.6, free-4.5, free-4.4, free-4.2, free-4.1,
free-4.0, free-3.4.2, free-3.4.1, free-3.4, free-3.3.1, free-3.3.0.2,
free-3.3.0.1, free-3.3, free-3.2, free-3.1.1, free-3.1, free-3.0, free-2.2,
free-2.1.1.1, free-2.1.1, free-2.1, free-2.0.3, free-2.0.2, free-2.0.1.1,
free-2.0.1, free-2.0 (conflict: recursion-schemes => free>=1.8 && <1.9)
trying: free-1.8.0.4
next goal: semigroups (dependency of free-1.8.0.4)
rejecting: semigroups-0.18.2, semigroups-0.18.1, semigroups-0.18.0.1,
semigroups-0.18, semigroups-0.17.0.1, semigroups-0.17, semigroups-0.16.2.2,
semigroups-0.16.2.1, semigroups-0.16.2, semigroups-0.16.1,
semigroups-0.16.0.1, semigroups-0.16, semigroups-0.15.4, semigroups-0.15.3,
semigroups-0.15.2, semigroups-0.15.1, semigroups-0.15, semigroups-0.14,
semigroups-0.13.0.1, semigroups-0.13, semigroups-0.12.2, semigroups-0.12.1,
semigroups-0.12.0.1, semigroups-0.12, semigroups-0.11, semigroups-0.10,
semigroups-0.9.2, semigroups-0.9.1, semigroups-0.9, semigroups-0.8.5,
semigroups-0.8.4.1, semigroups-0.8.4, semigroups-0.8.3.2, semigroups-0.8.3.1,
semigroups-0.8.3, semigroups-0.8.2, semigroups-0.8.0.1, semigroups-0.8,
semigroups-0.7.1.2, semigroups-0.7.1.1, semigroups-0.7.1, semigroups-0.7.0
(conflict: free => semigroups>=0.6 && <0.7)
rejecting: semigroups-0.6.1, semigroups-0.6 (conflict:
base==4.9.0.0/installed-4.9..., semigroups => base>=4 && <4.5)
rejecting: semigroups-0.5.0.2, semigroups-0.5.0.1, semigroups-0.5.0,
semigroups-0.4.0, semigroups-0.3.4.2, semigroups-0.3.4.1, semigroups-0.3.4,
semigroups-0.3.3, semigroups-0.3.2, semigroups-0.3.1, semigroups-0.3.0,
semigroups-0.2.0, semigroups-0.1.0 (conflict: free => semigroups>=0.6 && <0.7)
Dependency tree exhaustively searched.