// i must point at the (possibly imaginary) opening bracket (<)
// index returned is index of closing bracket (>)
static int tok_findEndOfAngleBracketPart(LS tok, int i) {
  int level = 1, j = i, level = 0, n = l(tok);
  while (j < n) {
    S t = tok.get(j);
    if (eq(t, "<")) ++level;
    else if (eq(t, ">")) --level;
    
    if (level == 0)
      ret j;
    j += 2;
  }
  ret n;
}