Resolving dependencies...
cabal: Could not resolve dependencies:
trying: sylvia-0.2.2 (user goal)
trying: base-4.9.0.0/installed-4.9... (dependency of sylvia-0.2.2)
next goal: void (dependency of sylvia-0.2.2)
rejecting: void-0.7.1, void-0.7, void-0.6.1, void-0.6 (conflict: sylvia =>
void>=0.5.5 && <0.6)
rejecting: void-0.5.12, void-0.5.11, void-0.5.10, void-0.5.8, void-0.5.7,
void-0.5.6, void-0.5.5.1, void-0.5.5 (conflict:
base==4.9.0.0/installed-4.9..., void => base>=3 && <4.8)
rejecting: void-0.5.4.3, void-0.5.4.2, void-0.5.4.1, void-0.5.4, void-0.5.3,
void-0.5.2, void-0.5.1, void-0.5.0, void-0.4, void-0.3, void-0.2, void-0.1
(conflict: sylvia => void>=0.5.5 && <0.6)
Dependency tree exhaustively searched.