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instance method

OptionParser#notwice

notwice(obj, prv, msg)

# File tmp/rubies/ruby-3.0.5/lib/optparse.rb, line 1303
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

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.