Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: computational-algebra (user goal)
rejecting: computational-algebra-0.3.0.0, 0.2.0.0, 0.1.3.6 (global constraint
requires ==0.1.3.5)
trying: computational-algebra-0.1.3.5
trying: base-4.8.1.0/installed-4f7... (dependency of
computational-algebra-0.1.3.5)
next goal: heaps (dependency of computational-algebra-0.1.3.5)
rejecting: heaps-0.3.2.1, 0.3.2, 0.3.1, 0.3.0.1 (conflict:
computational-algebra => heaps==0.2.*)
rejecting: heaps-0.2.3, 0.2.2, 0.2.1.1, 0.2 (conflict:
base==4.8.1.0/installed-4f7..., heaps => base>=4 && <4.8)
rejecting: heaps-0.1 (conflict: computational-algebra => heaps==0.2.*)
Dependency tree exhaustively searched.