Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: Vec-Boolean (user goal)
rejecting: Vec-Boolean-1.0.6, Vec-Boolean-1.0.5 (constraint from user target
requires ==1.0.4)
trying: Vec-Boolean-1.0.4
trying: base-4.9.0.0/installed-4.9... (dependency of Vec-Boolean-1.0.4)
next goal: Boolean (dependency of Vec-Boolean-1.0.4)
rejecting: Boolean-0.2.3, Boolean-0.2.2, Boolean-0.2.1, Boolean-0.2,
Boolean-0.1.2, Boolean-0.1.1, Boolean-0.1.0 (conflict: Vec-Boolean =>
Boolean==0.0.1)
rejecting: Boolean-0.0.1 (conflict: base==4.9.0.0/installed-4.9..., Boolean =>
base<4.8)
rejecting: Boolean-0.0.0 (conflict: Vec-Boolean => Boolean==0.0.1)
Dependency tree exhaustively searched.