Resolving dependencies... cabal: Could not resolve dependencies: next goal: creatur (user goal) rejecting: creatur-5.9.8.2, 5.9.8.1, 5.9.8, 5.9.7, 5.9.6, 5.9.5, 5.9.4, 5.9.3, 5.9.2, 5.9.1, 5.9.0, 5.8.2, 5.8.0, 5.7.3, 5.7.2, 5.7.1, 5.7.0, 5.6.9, 5.6.8, 5.6.7, 5.6.6, 5.6.5, 5.6.4, 5.6.3, 5.6.2, 5.6.1, 5.6.0, 5.5.1, 5.5.0, 5.4.2, 5.4.1, 5.4.0, 5.3.2, 5.3.1, 5.3.0, 5.2.11, 5.2.10, 5.2.9, 5.2.8, 5.2.7, 5.2.6, 5.2.5 (global constraint requires ==5.2.4) trying: creatur-5.2.4 next goal: transformers (dependency of creatur-5.2.4) rejecting: transformers-0.4.2.0/installed-21d..., 0.4.3.0, 0.4.2.0, 0.4.1.0 (conflict: creatur => transformers==0.3.*) trying: transformers-0.3.0.0 next goal: lens (dependency of creatur-5.2.4) rejecting: lens-4.13, 4.12.3, 4.12.2, 4.12.1, 4.12, 4.11.1, 4.11, 4.10, 4.9.1, 4.9, 4.8, 4.7.0.1, 4.7, 4.6.0.1, 4.6, 4.5, 4.4.0.2, 4.4.0.1, 4.4, 4.3.3, 4.3.2, 4.3.1, 4.3, 4.2, 4.1.2.1, 4.1.2, 4.1.1, 4.1 (conflict: creatur => lens==4.0.*) trying: lens-4.0.7 trying: transformers-compat-0.4.0.4 (dependency of lens-4.0.7) trying: transformers-compat-0.4.0.4:-two rejecting: transformers-compat-0.4.0.4:-three (conflict: transformers==0.3.0.0, 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) Dependency tree exhaustively searched.