This note summarizes the ruby exception Show archive.org snapshot hierarchy.

Exception
  NoMemoryError
  ScriptError
    LoadError
    NotImplementedError
    SyntaxError
  SignalException
    Interrupt
      Timeout::Error    # < ruby 1.9.2
  StandardError         # caught by rescue (default if no type was specified)
    ArgumentError
    IOError
      EOFError
    IndexError
    LocalJumpError
    NameError
      NoMethodError
    RangeError
      FloatDomainError
    RegexpError
    RuntimeError
      Timeout::Error    # >= ruby 1.9.2
    SecurityError
    SocketError
    SystemCallError
    SystemStackError
    ThreadError
    TypeError
    ZeroDivisionError
  SystemExit
  fatal

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