Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: terrahs (user goal)
rejecting: terrahs-0.9 (constraint from user target requires ==0.8)
rejecting: terrahs-0.8 (conflict: requires Generics)
rejecting: terrahs-0.7, terrahs-0.6, terrahs-0.5 (constraint from user target
requires ==0.8)
Dependency tree exhaustively searched.