Resolving dependencies... cabal: Could not resolve dependencies: next goal: c2hsc (user goal) rejecting: c2hsc-0.6.5, c2hsc-0.6.4, c2hsc-0.6.3, c2hsc-0.6.2, c2hsc-0.5.1, c2hsc-0.5.0, c2hsc-0.4.0, c2hsc-0.3.3, c2hsc-0.3.2, c2hsc-0.3.1, c2hsc-0.3.0, c2hsc-0.2.0 (constraint from user target requires ==0.1.0) trying: c2hsc-0.1.0 trying: base-4.9.0.0/installed-4.9... (dependency of c2hsc-0.1.0) trying: transformers-0.5.2.0/installed-0.5... (dependency of c2hsc-0.1.0) next goal: mtl (dependency of c2hsc-0.1.0) rejecting: mtl-2.2.1, mtl-2.2.0.1, mtl-2.2, mtl-2.1.3.1, mtl-2.1.2, mtl-2.1.1, mtl-2.1 (conflict: c2hsc => mtl>=1.1 && <2.1) rejecting: mtl-2.0.1.1 (conflict: transformers==0.5.2.0/installed-0.5..., mtl => transformers==0.2.*) rejecting: mtl-2.0.1.0, mtl-2.0.0.0, mtl-1.1.1.1, mtl-1.1.1.0 (conflict: base==4.9.0.0/installed-4.9..., mtl => base<4.6) rejecting: mtl-1.1.0.2, mtl-1.1.0.1, mtl-1.1.0.0 (conflict: base==4.9.0.0/installed-4.9..., mtl => base<4.3) rejecting: mtl-1.0 (conflict: c2hsc => mtl>=1.1 && <2.1) Dependency tree exhaustively searched.