Resolving dependencies...
cabal: Could not resolve dependencies:
trying: servant-aeson-specs-0.6.0.0 (user goal)
trying: base-4.10.1.0/installed-4.1... (dependency of
servant-aeson-specs-0.6.0.0)
next goal: servant (dependency of servant-aeson-specs-0.6.0.0)
rejecting: servant-0.12.1, servant-0.12, servant-0.11 (conflict:
servant-aeson-specs => servant>=0.4 && <0.11)
rejecting: servant-0.10, 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 (conflict:
base==4.10.1.0/installed-4.1..., servant => base>=4.7 && <4.10)
rejecting: servant-0.7, servant-0.6.1, servant-0.6, servant-0.5,
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==4.10.1.0/installed-4.1..., 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 && <0.11)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: base, servant, servant-aeson-specs