R Under development (unstable) (2025-05-03 r88188 ucrt) -- "Unsuffered Consequences"
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> require(robustlmm)
Loading required package: robustlmm
Loading required package: lme4
Loading required package: Matrix
> 
> testData <- generateAnovaDatasets(1, c(2, 5), c(3, 5), 10)$generateData(1)
> rlmer(y ~ (1 + Var1|Var2) + (1 + Var4|Var3), testData, max.iter = 1)
boundary (singular) fit: see help('isSingular')
Robust linear mixed model fit by DASvar 
Formula: y ~ (1 + Var1 | Var2) + (1 + Var4 | Var3) 
   Data: testData 
Random effects:
 Groups   Name        Std.Dev. Corr     
 Var2     (Intercept)  0.2239           
          Var1ii       0.8303  0.70     
 Var3     (Intercept) 16.6385           
          Var4II       0.5694  1.00     
          Var4III      5.8699  0.71 0.72
 Residual              4.0518           
Number of obs: 1500, groups: Var2, 5; Var3, 5
Fixed Effects:
(Intercept)  
      10.49  
Warning message:
In .rlmerInit(lcall, pf, formula, data, method, rho.e, rho.b, rho.sigma.e,  :
  Method 'DAStau' does not support blocks of size larger than 2. Falling back to method 'DASvar'.
> ## test is that this runs without errors
> 
> proc.time()
   user  system elapsed 
   2.40    0.20    2.59