Failure @29 (⟨1, 29⟩): expected token
Final stack:
 • `scheme
 • [(Lean.Doc.Syntax.named_no_paren
      `dialect
      ":="
      (Lean.Doc.Syntax.arg_str
       (str "\"chicken\"")))
     (Lean.Doc.Syntax.flag_on "+" <missing>)
     (Lean.Doc.Syntax.anon
      (Lean.Doc.Syntax.arg_num (num "99")))]

Remaining: " 99"