Success! Final stack:
  (Lean.Doc.Syntax.codeblock
   "```"
   [`scheme
    [(Lean.Doc.Syntax.named_no_paren
      `dialect
      ":="
      (Lean.Doc.Syntax.arg_str
       (str "\"chicken\"")))
     (Lean.Doc.Syntax.anon
      (Lean.Doc.Syntax.arg_num (num "43")))]]
   "\n"
   (str "\"(define x 4)\\nx\\n\"")
   "```")
All input consumed.