Resolving dependencies... cabal: Could not resolve dependencies: next goal: digest-pure (user goal) rejecting: digest-pure-0.0.3, 0.0.2 (global constraint requires ==0.0.1) trying: digest-pure-0.0.1 trying: base-4.7.0.1/installed-e4b... (dependency of digest-pure-0.0.1) next goal: array (dependency of digest-pure-0.0.1) rejecting: array-0.5.0.0/installed-98a..., 0.5.1.0, 0.5.0.0, 0.4.0.1, 0.4.0.0 (conflict: digest-pure => array>=0.3.0.2 && <0.4) rejecting: array-0.3.0.3 (conflict: base==4.7.0.1/installed-e4b..., array => base>=4.2 && <4.5) rejecting: array-0.3.0.2 (conflict: base==4.7.0.1/installed-e4b..., array => base>=4.2 && <4.4) rejecting: array-0.3.0.1, 0.3.0.0, 0.2.0.0, 0.1.0.0 (conflict: digest-pure => array>=0.3.0.2 && <0.4) Dependency tree exhaustively searched.