Success! Final stack:
  (Lean.Doc.Syntax.directive
   ":::"
   `multiPara
   [(Lean.Doc.Syntax.named_no_paren
     `greatness
     ":="
     (Lean.Doc.Syntax.arg_str
      (str "\"amazing!\"")))]
   "\n"
   [(Lean.Doc.Syntax.para
     "para{"
     [(Lean.Doc.Syntax.text (str "\"foo\""))]
     "}")]
   ":::")
All input consumed.