method

notwice

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notwice(obj, prv, msg) private

Checks if an argument is given twice, in which case an ArgumentError is raised. Called from OptionParser#switch only.

`obj`	New argument.
`prv`	Previously specified argument.
`msg`	Exception message.

Show source

# File lib/optparse.rb, line 1264
  def notwice(obj, prv, msg)
    unless !prv or prv == obj
      raise(ArgumentError, "argument #{msg} given twice: #{obj}",
            ParseError.filter_backtrace(caller(2)))
    end
    obj
  end

notwice

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