Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: servant-aeson-specs (user goal)
rejecting: servant-aeson-specs-0.5.2.0, servant-aeson-specs-0.5.1.1,
servant-aeson-specs-0.5.1.0, servant-aeson-specs-0.5.0.0,
servant-aeson-specs-0.4.1, servant-aeson-specs-0.4, servant-aeson-specs-0.3,
servant-aeson-specs-0.2 (constraint from user target requires ==0.1)
trying: servant-aeson-specs-0.1
trying: base-4.9.0.0/installed-4.9... (dependency of servant-aeson-specs-0.1)
next goal: servant (dependency of servant-aeson-specs-0.1)
rejecting: servant-0.9.1.1, servant-0.9.1, servant-0.9.0.1, servant-0.9,
servant-0.8.1, servant-0.8, servant-0.7.1, servant-0.7, servant-0.6.1,
servant-0.6, servant-0.5 (conflict: servant-aeson-specs => servant==0.4.*)
rejecting: servant-0.4.4.7, servant-0.4.4.6, servant-0.4.4.5, servant-0.4.4.4,
servant-0.4.4.3, servant-0.4.4.2, servant-0.4.4, servant-0.4.3.1,
servant-0.4.3, servant-0.4.2, servant-0.4.1, servant-0.4.0 (conflict:
base==4.9.0.0/installed-4.9..., servant => base>=4.7 && <4.9)
rejecting: servant-0.2.2, servant-0.2.1, servant-0.2, servant-0.1 (conflict:
servant-aeson-specs => servant==0.4.*)
Dependency tree exhaustively searched.