This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

private_class_method 

        # Module.private_class_method

(from ruby core)
---
    mod.private_class_method(symbol, ...)   -> mod
    mod.private_class_method(string, ...)   -> mod
    mod.private_class_method(array)         -> mod

---

Makes existing class methods private. Often used to hide the default
constructor `new`.

String arguments are converted to symbols. An Array of Symbols and/or
Strings is also accepted.

    class SimpleSingleton  # Not thread safe
      private_class_method :new
      def SimpleSingleton.create(*args, &block)
        @me = new(*args, &block) if ! @me
        @me
      end
    end

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.