Resolving dependencies...
cabal: Could not resolve dependencies:
trying: goal-simulation-0.1 (user goal)
trying: transformers-0.5.2.0/installed-0.5... (dependency of mtl-2.2.1)
next goal: machines (dependency of goal-simulation-0.1)
rejecting: machines-0.6.1, machines-0.6 (conflict: goal-simulation =>
machines==0.5.*)
rejecting: machines-0.5.1 (conflict: transformers==0.5.2.0/installed-0.5...,
machines => transformers>=0.3 && <0.5)
rejecting: machines-0.4.1, machines-0.4.0.1, machines-0.4, machines-0.2.5,
machines-0.2.4, machines-0.2.3.1, machines-0.2.3, machines-0.2.2,
machines-0.2.1.3, machines-0.2.1.2, machines-0.2.1.1, machines-0.2.1,
machines-0.1.2, machines-0.1.1, machines-0.1 (conflict: goal-simulation =>
machines==0.5.*)
Dependency tree exhaustively searched.