private static PsiMethodCallExpression getMethodCallExpression(PsiMethodReferenceExpression methodRef) {
    PsiLambdaExpression lambdaExpression =
      LambdaRefactoringUtil.convertMethodReferenceToLambda(methodRef, true, true);
    List<PsiExpression> returnExpressions = LambdaUtil.getReturnExpressions(lambdaExpression);
    if (returnExpressions.size() != 1) return null;
    PsiExpression expression = returnExpressions.get(0);
    if (!(expression instanceof PsiMethodCallExpression)) return null;
    return (PsiMethodCallExpression)expression;
  }
private static PsiMethodCallExpression getMethodCallExpression(PsiMethodReferenceExpression methodRef)