Resolving dependencies...
cabal: Could not resolve dependencies:
trying: servant-matrix-param-0.2 (user goal)
trying: base-4.9.0.0/installed-4.9... (dependency of servant-matrix-param-0.2)
next goal: servant (dependency of servant-matrix-param-0.2)
rejecting: servant-0.8, servant-0.7.1, servant-0.7, servant-0.6.1, servant-0.6
(conflict: servant-matrix-param => servant==0.5)
rejecting: servant-0.5 (conflict: base==4.9.0.0/installed-4.9..., servant =>
base>=4.7 && <4.9)
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, servant-0.2.2,
servant-0.2.1, servant-0.2, servant-0.1 (conflict: servant-matrix-param =>
servant==0.5)
Dependency tree exhaustively searched.