Resolving dependencies... cabal: Could not resolve dependencies: next goal: bytestring-show (user goal) rejecting: bytestring-show-0.3.5.6, bytestring-show-0.3.5.5, bytestring-show-0.3.5.4 (constraint from user target requires ==0.3.5.3) trying: bytestring-show-0.3.5.3 trying: base-4.9.0.0/installed-4.9... (dependency of bytestring-show-0.3.5.3) next goal: deepseq (dependency of containers-0.5.9.1) rejecting: deepseq-1.4.2.0/installed-1.4... (conflict: deepseq => array==0.5.1.1/installed-0.5..., bytestring-show => array<0.5) trying: deepseq-1.4.2.0 next goal: array (dependency of bytestring-show-0.3.5.3) rejecting: array-0.5.1.1/installed-0.5..., array-0.5.1.1, array-0.5.1.0, array-0.5.0.0 (conflict: bytestring-show => array<0.5) rejecting: array-0.4.0.1 (conflict: base==4.9.0.0/installed-4.9..., array => base>=4.2 && <4.7) rejecting: array-0.4.0.0 (conflict: base==4.9.0.0/installed-4.9..., array => base>=4.2 && <4.6) 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, array-0.3.0.1 (conflict: base==4.9.0.0/installed-4.9..., array => base>=4.2 && <4.4) rejecting: array-0.3.0.0 (conflict: base==4.9.0.0/installed-4.9..., array => base>=3 && <4.4) rejecting: array-0.2.0.0, array-0.1.0.0 (conflict: deepseq => array>=0.3 && <0.6) Dependency tree exhaustively searched.