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Showing content from https://docs.ruby-lang.org/en/3.1/OptionParser/Switch/RequiredArgument.html below:

class OptionParser::Switch::RequiredArgument - RDoc Documentation

Switch that takes an argument.

parse(arg, argv) click to toggle source

Raises an exception if argument is not present.

# File lib/optparse.rb, line 706
def parse(arg, argv)
  unless arg
    raise MissingArgument if argv.empty?
    arg = argv.shift
  end
  conv_arg(*parse_arg(arg, &method(:raise)))
end

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