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

get_candidates

        # OptionParser::List.get_candidates

(from ruby core)
### Implementation from List
---
    get_candidates(id) { |__send__(id).keys| ... }

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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.