Fix XML indentation in Emacs mode The return value of MATCH-STRING is a string. At least on Emacs 25, the comparisons between string and character with EQUAL could never succeed, and so the cases for matching braces were never triggered. GET-TEXT-PROPERTY may return a list rather than an atom (for example, on long lines with whitespace-mode turned on), and this broke the heuristic of looking for the tag face in previous text.

functor Make(M : sig
                 type data
                 val inj : sql_injectable data
             end) : sig
    type ref
    val new : M.data -> transaction ref
    val read : ref -> transaction M.data
    val write : ref -> M.data -> transaction unit
    val delete : ref -> transaction unit
end