class RuboCop::Cop::Layout::MultilineBlockLayout

def on_block(node)
  return if node.single_line?
  unless args_on_beginning_line?(node)
    add_offense_for_expression(node, node.arguments, ARG_MSG)
  end
  return unless node.body && node.loc.begin.line == node.body.first_line
  add_offense_for_expression(node, node.body, MSG)
end