Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: fast-arithmetic (user goal)
[__0] rejecting: fast-arithmetic-0.6.5.1, fast-arithmetic-0.6.5.0,
fast-arithmetic-0.6.4.3, fast-arithmetic-0.6.4.2, fast-arithmetic-0.6.4.1,
fast-arithmetic-0.6.4.0, fast-arithmetic-0.6.3.0, fast-arithmetic-0.6.2.3,
fast-arithmetic-0.6.2.2, fast-arithmetic-0.6.2.0, fast-arithmetic-0.6.1.1,
fast-arithmetic-0.6.0.9, fast-arithmetic-0.6.0.8, fast-arithmetic-0.6.0.7,
fast-arithmetic-0.6.0.6, fast-arithmetic-0.6.0.5, fast-arithmetic-0.6.0.4,
fast-arithmetic-0.6.0.3, fast-arithmetic-0.6.0.2, fast-arithmetic-0.6.0.1,
fast-arithmetic-0.5.0.0, fast-arithmetic-0.4.0.0, fast-arithmetic-0.3.3.7
(constraint from user target requires ==0.3.3.6)
[__0] trying: fast-arithmetic-0.3.3.6
[__1] next goal: base (dependency of fast-arithmetic)
[__1] rejecting: base-4.14.1.0/installed-4.14.1.0 (conflict: fast-arithmetic
=> base>=5 && <5)
[__1] skipping: base-4.15.0.0, 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 (has the same characteristics that
caused the previous version to fail: excluded by constraint '>=5 && <5' from
'fast-arithmetic')
[__1] fail (backjumping, conflict set: base, fast-arithmetic)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: fast-arithmetic, base