@Contract("null -> null")
  @Nullable
  private static PsiExpression getLeftHandOfAssignment(PsiExpression rExpression) {
    if(rExpression == null) return null;
    if(rExpression.getParent() instanceof PsiAssignmentExpression) {
      return ((PsiAssignmentExpression)rExpression.getParent()).getLExpression();
    }
    return null;
  }
@Contract("null -> null")
  @Nullable
  private static PsiExpression getLeftHandOfAssignment(PsiExpression rExpression)