@Nullable
  private static PyTargetExpression findSingleForLoopTarget(@NotNull PyForStatement forLoop) {
    final PyForPart forPart = forLoop.getForPart();
    final PyExpression forTarget = forPart.getTarget();
    if (forTarget instanceof PyTargetExpression) {
      return (PyTargetExpression)forTarget;
    }
    return null;
  }
@Nullable
  private static PyTargetExpression findSingleForLoopTarget(@NotNull PyForStatement forLoop)