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

Reline::Config::InvalidInputrc 

        # Reline::Config::InvalidInputrc < RuntimeError

(from ruby core)
---
# Instance methods:

    file
    lineno

# Attributes:

    attr_accessor file
    attr_accessor lineno

(from gem reline-0.3.2)
---
# Instance methods:

    file
    lineno

# Attributes:

    attr_accessor file
    attr_accessor lineno

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.