Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: diagrams (user goal)
rejecting: diagrams-1.3, 1.2, 1.1.0.1, 1.1, 1.0.0.1, 1.0, 0.7.1.1, 0.7.1, 0.7,
0.6, 0.5, 0.4, 0.3, 0.2.2.3, 0.2.2.2, 0.2.2.1, 0.2.2, 0.2.1.3, 0.2.1.2,
0.2.1.1 (global constraint requires ==0.2.1)
trying: diagrams-0.2.1
trying: base-4.7.0.1/installed-e4b... (dependency of diagrams-0.2.1)
next goal: colour (dependency of diagrams-0.2.1)
rejecting: colour-2.3.3, 2.3.2, 2.3.1, 2.3.0 (conflict: diagrams =>
colour>=2.2.1 && <2.3)
rejecting: colour-2.2.1 (conflict: base==4.7.0.1/installed-e4b..., colour =>
base<4.5)
rejecting: colour-2.2.0, 2.1.0, 2.0.0, 1.1.0, 1.0.0, 0.0.0 (conflict: diagrams
=> colour>=2.2.1 && <2.3)
Dependency tree exhaustively searched.