@Nullable
  public static GrExpression getBase(@NotNull GrMethodCall callExpression) {
    GrExpression expression = callExpression.getInvokedExpression();
    GrReferenceExpression invokedExpression = (GrReferenceExpression)expression;
    GrExpression qualifier = invokedExpression.getQualifierExpression();
    if (isSuperExpression(qualifier)) return null;
    return qualifier;
  }
@Nullable
  public static GrExpression getBase(@NotNull GrMethodCall callExpression)