Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: beam-th (user goal)
rejecting: beam-th-0.2.0.0, beam-th-0.1.0.3 (constraint from user target
requires ==0.1.0.2)
trying: beam-th-0.1.0.2
trying: base-4.9.0.0/installed-4.9... (dependency of beam-th-0.1.0.2)
next goal: beam (dependency of beam-th-0.1.0.2)
rejecting: beam-0.3.2.0, beam-0.3.1.0, beam-0.3.0.0 (conflict:
base==4.9.0.0/installed-4.9..., beam => base>=4.7 && <4.9)
Dependency tree exhaustively searched.