Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: primitive-extras-0.4 (user goal)
[__1] next goal: focus (dependency of primitive-extras)
[__1] rejecting: focus-0.1.5.2, focus-0.1.5.1, focus-0.1.5, focus-0.1.4,
focus-0.1.3, focus-0.1.2, focus-0.1.1, focus-0.1.0 (conflict: primitive-extras
=> focus>=0.11.2.1 && <0.12)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: primitive-extras, focus