Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: servant-swagger (user goal)
rejecting: servant-swagger-1.1.2, servant-swagger-1.1.1, servant-swagger-1.1,
servant-swagger-1.0.3, servant-swagger-1.0.2, servant-swagger-1.0.1,
servant-swagger-1.0 (constraint from user target requires ==0.1.2)
trying: servant-swagger-0.1.2
trying: base-4.9.0.0/installed-4.9... (dependency of servant-swagger-0.1.2)
next goal: swagger2 (dependency of servant-swagger-0.1.2)
rejecting: swagger2-2.1.3, swagger2-2.1.2.1, swagger2-2.1.2, swagger2-2.1.1,
swagger2-2.1, swagger2-2.0.2, swagger2-2.0.1, swagger2-2.0 (conflict:
servant-swagger => swagger2>=1 && <2)
rejecting: swagger2-1.2.1, swagger2-1.2, swagger2-1.1.1, swagger2-1.1,
swagger2-1.0 (conflict: base==4.9.0.0/installed-4.9..., swagger2 => base>=4.8
&& <4.9)
rejecting: swagger2-0.4.1, swagger2-0.4, swagger2-0.3, swagger2-0.2,
swagger2-0.1 (conflict: servant-swagger => swagger2>=1 && <2)
Dependency tree exhaustively searched.