This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.
# Exception.to_s (from ruby core) --- exception.to_s -> string --- Returns exception's message (or the name of the exception if no message is set).
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.