, "internal spaces" =:            "\\RN{ 2 3 }" =?>            para (str "II3")          , "internal spaces many words" =:            "\\RN{5 hello there}" =?>            para (str "V" <> str "HELLO" <> space <> "THERE")          , "newlines" =:            "\\RN{\n15\n17\n}" =?>            para (str "XV17")          , "number then space then non-number" =:            "\\Rn{5 HELLO}" =?>            para (str "vHELLO")          , "number then non-number, non-number gets upcased by RN" =:            "\\RN{4hello}" =?>            para (str "IVHELLO")          , "internal command" =:            "\\Rn{4\\textit{8}}" =?>            para (str "iv" <> emph (str "8"))          , "dotted" =:            "\\RN{3.8}" =?>            para (str "III.8")          , "negative" =:            "\\RN{-3}" =?>            (mempty :: Blocks)          , "double negative" =:            "\\RN{--3}" =?>            para (str "III")          , "triple negative" =:            "\\RN{---3 2}" =?>            para (str "2")          , "quadruple negative" =:            "\\RN{----3 2}" =?>            para (str "III2")          , "negative zero" =:            "\\RN{-0}" =?>            (mempty :: Blocks)          , "spaced negative" =:            "\\RN{- 3 5}" =?>            para (str "5")          , "spaced double negative" =:            "\\Rn{- - 3 5}" =?>            para (str "iii5")          , "internal hyphen" =:            "\\RN{3-5}" =?>            para (str "III-5")          , "space then unbraced argument" =:            "\\RN 7 ok" =?>            para (str "VII" <> space <> str "ok")          , "space then unbraced argument with trailing nondigits" =:            "\\RN 7ok" =?>            para (str "VIIok")          , "multiple zeroes" =:            "\\Rn{0 0 3}" =?>            para (str "0" <> space <> str "3")          -- The next cases cause errors when processed by LaTeX, but we would rather produce wonky output than fail.          -- Other things that make biblatex error, and hence which we don't mind if they don't work:          -- - "\\RN{hello}"          -- - "\\RN\n\n"          , "argument in textit" =:            "\\RN{\\textit{8}}" =?>            para (emph (str "8"))          , "leading dot" =:            "\\Rn{.3}" =?>            para (str ".3")          , "empty brace" =:            "\\RN{}" =?>            (mempty :: Blocks)