Success! Final stack:
  [(Lean.Doc.Syntax.para
    "para{"
    [(Lean.Doc.Syntax.text (str "\"Blah blah\""))
     (Lean.Doc.Syntax.footnote
      "[^"
      (str "\"1\"")
      "]")]
    "}")
   (Lean.Doc.Syntax.footnote_ref
    "[^"
    (str "\"1\"")
    "]:"
    [(Lean.Doc.Syntax.text
      (str "\"More can be said\""))])]
All input consumed.