Success! Final stack:
  [(Lean.Doc.Syntax.para
    "para{"
    [(Lean.Doc.Syntax.text
      (str
       "\"I can describe lists like this one:\""))]
    "}")
   (Lean.Doc.Syntax.ul
    "ul{"
    [(Lean.Doc.Syntax.li
      "*"
      [(Lean.Doc.Syntax.para
        "para{"
        [(Lean.Doc.Syntax.text (str "\"a\""))]
        "}")])
     (Lean.Doc.Syntax.li
      "*"
      [(Lean.Doc.Syntax.para
        "para{"
        [(Lean.Doc.Syntax.text (str "\"b\""))]
        "}")])]
    "}")]
All input consumed.