Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: trifecta (user goal)
rejecting: trifecta-1.5.1.3, 1.5.1.2, 1.5.1.1, 1.5.1, 1.5, 1.4.3, 1.4.2,
1.4.1, 1.4, 1.2.1.1, 1.2.1, 1.2, 1.1, 1.0, 0.53, 0.52, 0.51.0.1, 0.51,
0.50.2.1, 0.50.1, 0.50, 0.49.1, 0.49, 0.47, 0.46, 0.45, 0.44, 0.43, 0.42,
0.41, 0.40, 0.39, 0.38, 0.37, 0.36.3, 0.36.2, 0.36.1, 0.36, 0.35, 0.34,
0.32.1, 0.32, 0.31, 0.30, 0.29, 0.28, 0.27, 0.26, 0.25, 0.24, 0.23, 0.22,
0.21, 0.20, 0.19, 0.18, 0.17, 0.16.1, 0.16, 0.15.1, 0.15, 0.14, 0.13, 0.12,
0.11, 0.10, 0.9, 0.8.0.1, 0.8, 0.7.2, 0.7.1, 0.7, 0.6 (global constraint
requires ==0.5.1)
trying: trifecta-0.5.1
trying: base-4.7.0.1/installed-e4b... (dependency of trifecta-0.5.1)
next goal: parallel (dependency of trifecta-0.5.1)
rejecting: parallel-3.2.0.6, 3.2.0.5, 3.2.0.4, 3.2.0.3, 3.2.0.2, 3.2.0.0
(conflict: trifecta => parallel>=3.1.0.1 && <3.2)
trying: parallel-3.1.0.1
next goal: array (dependency of parallel-3.1.0.1)
rejecting: array-0.5.0.0/installed-98a..., 0.5.1.0, 0.5.0.0, 0.4.0.1, 0.4.0.0
(conflict: parallel => array>=0.1 && <0.4)
rejecting: array-0.3.0.3 (conflict: base==4.7.0.1/installed-e4b..., array =>
base>=4.2 && <4.5)
rejecting: array-0.3.0.2, 0.3.0.1 (conflict: base==4.7.0.1/installed-e4b...,
array => base>=4.2 && <4.4)
rejecting: array-0.3.0.0 (conflict: base==4.7.0.1/installed-e4b..., array =>
base>=3 && <4.4)
rejecting: array-0.2.0.0, 0.1.0.0 (conflict: base==4.7.0.1/installed-e4b...,
array => base<4.3)
Dependency tree exhaustively searched.