Resolving dependencies...
cabal: Could not resolve dependencies:
trying: halma-0.1.0.1 (user goal)
trying: mvc-1.0.3 (dependency of halma-0.1.0.1)
trying: transformers-0.3.0.0/installed-16a... (dependency of mvc-1.0.3)
trying: contravariant-1.2.0.1 (dependency of mvc-1.0.3)
trying: transformers-compat-0.4.0.4 (dependency of contravariant-1.2.0.1)
trying: transformers-compat-0.4.0.4:-two
rejecting: transformers-compat-0.4.0.4:-three (conflict:
transformers==0.3.0.0/installed-16a..., transformers-compat-0.4.0.4:three =>
transformers>=0.4.1 && <0.5)
rejecting: transformers-compat-0.4.0.4:+three (manual flag can only be changed
explicitly)
Backjump limit reached (change with --max-backjumps).