class NameError < StandardError
attr_accessor :name
def initialize(message=nil, name=nil)
@name = name
super(message)
end
end
class NoMethodError < NameError
attr_reader :args
def initialize(message=nil, name=nil, args=nil)
@args = args
super message, name
end
end
class StopIteration < IndexError
attr_accessor :result
end