Can Anyone point Me to a tool to detect unused code, objects, methods, parameters, etc., in Ruby code?

I saw `nitpick` but it does not seem to give me the coverage I want. I also checked `laser` and `reek` but their respective gems seem to have issues which prevent them from running.

I thought at one point the Ruby binary had a mode which would detect unused constructs but I do not seem to be able to find it.