class RuboCop::Cop::Lint::SpaceBeforeFirstArg

def on_send(node)
  return if parentheses?(node)
  _receiver, method_name, *args = *node
  return if args.empty?
  return if operator?(method_name)
  return if method_name.to_s.end_with?('=')
  # Setter calls with parentheses are parsed this way. The parentheses
  # belong to the argument, not the send node.
  return if args.first.type == :begin
  arg1 = args.first.loc.expression
  arg1_with_space = range_with_surrounding_space(arg1, :left)
  space = Parser::Source::Range.new(arg1.source_buffer,
                                    arg1_with_space.begin_pos,
                                    arg1.begin_pos)
  add_offense(space, arg1) if arg1_with_space.source =~ /\A\S/
end