class RuboCop::Cop::Style::RedundantFormat

def argument_value(argument)
  argument = argument.children.first if argument.begin_type?
  if argument.dsym_type?
    dsym_value(argument)
  elsif argument.hash_type?
    hash_value(argument)
  elsif rational_number?(argument)
    rational_value(argument)
  elsif complex_number?(argument)
    complex_value(argument)
  elsif argument.respond_to?(:value)
    argument.value
  else
    argument.source
  end
end