Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: acme-php (user goal)
rejecting: acme-php-0.0.5 (constraint from user target requires ==0.0.4)
trying: acme-php-0.0.4
trying: base-4.9.0.0/installed-4.9... (dependency of acme-php-0.0.4)
next goal: acme-left-pad (dependency of acme-php-0.0.4)
rejecting: acme-left-pad-3.0, acme-left-pad-2.0 (conflict:
base==4.9.0.0/installed-4.9..., acme-left-pad => base>=4.8 && <4.9)
rejecting: acme-left-pad-1.0 (conflict: acme-php => acme-left-pad>=2)
Dependency tree exhaustively searched.