Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] trying: smuggler-0.0.0 (user goal)
[__1] next goal: ghc (dependency of smuggler)
[__1] rejecting: ghc-8.4.3/installed-8.4..., ghc-8.4.1, ghc-8.2.2, ghc-8.2.1
(conflict: smuggler => ghc>=8.6.0)
[__1] fail (backjumping, conflict set: ghc, smuggler)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: smuggler, ghc