// i must point at the opening bracket (any of the 2 types, not type parameters)
// index returned is index of closing bracket + 1
static int findEndOfBracketPart_strict(List<String> cnc, int i) {
  int j = i+2;
  LS open = ll(cnc.get(i));
  while (j < cnc.size()) {
    if (eqOneOf(cnc.get(j), "{", "(")) ++level;
    else if (eqOneOf(cnc.get(j), "}", ")")) --level;
    if (level == 0)
      return j+1;
    ++j;
  }
  return cnc.size();
}

Began life as a copy of #1001165