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.

datatype t = A | B

val a = A
val b = B

datatype foo = C of t

val c = C a

datatype list = Nil | Cons of {Head : int, Tail : list}

val nil = Nil
val l1 = Cons {Head = 0, Tail = nil}

datatype term = App of term * term | Abs of term -> term