Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: lambdabot (user goal)
rejecting: lambdabot-5.0.2.2, 5.0.2.1, 5.0.1, 5.0, 4.3.0.1, 4.3, 4.2.3.3,
4.2.3.2, 4.2.3.1, 4.2.3.0, 4.2.2.1, 4.2.2, 4.2.1, 4.1 (global constraint
requires ==4.0)
trying: lambdabot-4.0
next goal: fps (dependency of lambdabot-4.0)
Dependency tree exhaustively searched.