definitely_rescued_exception.rb

class DefinitelyRescuedException < Exception
  def is_a? _klass
    true
  end
  def < _klass
    true
  end
  def > _klass
    false
  end
end

class OrdinayException < Exception ; end

begin
  raise DefinitelyRescuedException
rescue StandardError => e
  puts "I rescued: #{e.class}"
end

begin
  raise OrdinayException
rescue StandardError => e
  puts "I rescued: #{e.class}"
end