Resolving dependencies... cabal: Could not resolve dependencies: next goal: digest-pure (user goal) rejecting: digest-pure-0.0.3, digest-pure-0.0.2 (constraint from user target requires ==0.0.1) trying: digest-pure-0.0.1 trying: base-4.9.0.0/installed-4.9... (dependency of digest-pure-0.0.1) next goal: array (dependency of digest-pure-0.0.1) rejecting: array-0.5.1.1/installed-0.5..., array-0.5.1.1, array-0.5.1.0, array-0.5.0.0, array-0.4.0.1, array-0.4.0.0 (conflict: digest-pure => array>=0.3.0.2 && <0.4) rejecting: array-0.3.0.3 (conflict: base==4.9.0.0/installed-4.9..., array => base>=4.2 && <4.5) rejecting: array-0.3.0.2 (conflict: base==4.9.0.0/installed-4.9..., array => base>=4.2 && <4.4) rejecting: array-0.3.0.1, array-0.3.0.0, array-0.2.0.0, array-0.1.0.0 (conflict: digest-pure => array>=0.3.0.2 && <0.4) Dependency tree exhaustively searched.