// i = last C token of type
// returns first C token of type
static int tok_scanTypeBackwards(LS tok, int i) {
  if (i < 0) ret i;
  int level = 0;
  while (i > 0) {
    S t = tok.get(i);
    if (isIdentifier(t) && level == 0) ret i;
    if (eq(t, ">")) ++level;
    else if (eq(t, "<")) --level;
    i -= 2;
  }
  ret i;
}