class Rufo::Formatter

def visit_for(node)
  #[:for, var, collection, body]
  _, var, collection, body = node
  line = @line
  consume_keyword "for"
  consume_space
  visit_comma_separated_list to_ary(var)
  skip_space
  if comma?
    check :on_comma
    write ","
    next_token
    skip_space_or_newline
  end
  consume_space
  consume_keyword "in"
  consume_space
  visit collection
  skip_space
  indent_body body
  write_indent if @line != line
  consume_keyword "end"
end