(script
  (return_statement
    (xhp_expression
      (xhp_open
        (xhp_identifier))
      (xhp_string)
      (xhp_comment)
      (xhp_string)
      (braced_expression
        (variable))
      (xhp_string)
      (xhp_comment)
      (xhp_string)
      (xhp_close
        (xhp_identifier)))))