2 failures:
  @1 (⟨1, 1⟩): expected identifier
    "\ntest}\nHere's a modified paragraph."
  @36 (⟨3, 28⟩): unexpected end of input; expected '![', '$$', '$', '*', '[', '[^', '_', '`' or '{'
    ""

Final stack:
  (Lean.Doc.Syntax.para
   "para{"
   [(Lean.Doc.Syntax.role
     "{"
     <missing>
     "["
     [(Lean.Doc.Syntax.footnote <missing>)]
     "]")])