Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: synthesizer-filter (user goal)
rejecting: synthesizer-filter-0.4.1, synthesizer-filter-0.4.0.2,
synthesizer-filter-0.4.0.1 (constraint from user target requires ==0.4)
trying: synthesizer-filter-0.4
trying: base-4.9.0.0/installed-4.9... (dependency of synthesizer-filter-0.4)
next goal: containers (dependency of synthesizer-filter-0.4)
rejecting: containers-0.5.7.1/installed-0.5..., containers-0.5.8.1,
containers-0.5.7.1, containers-0.5.7.0, containers-0.5.6.3,
containers-0.5.6.2, containers-0.5.6.1, containers-0.5.6.0,
containers-0.5.5.1, containers-0.5.5.0, containers-0.5.4.0,
containers-0.5.3.1, containers-0.5.3.0, containers-0.5.2.1,
containers-0.5.2.0, containers-0.5.1.0, containers-0.5.0.0,
containers-0.4.2.1, containers-0.4.2.0, containers-0.4.1.0, containers-0.4.0.0
(conflict: synthesizer-filter => containers>=0.1 && <0.4)
rejecting: containers-0.3.0.0 (conflict: base==4.9.0.0/installed-4.9...,
containers => base>=4.2 && <4.7)
rejecting: containers-0.2.0.1, containers-0.2.0.0 (conflict:
base==4.9.0.0/installed-4.9..., containers => base<4.7)
rejecting: containers-0.1.0.1, containers-0.1.0.0 (conflict:
base==4.9.0.0/installed-4.9..., containers => base<4.3)
Dependency tree exhaustively searched.