R Under development (unstable) (2023-07-03 r84633 ucrt) -- "Unsuffered Consequences"
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> library(lme4)
Loading required package: Matrix
> 
> if (.Platform$OS.type != "windows") {
+ data(Orthodont, package="nlme")
+ fm1 <- lmer(distance ~ age + (age|Subject), data = Orthodont)
+ VarCorr(fm1)
+ 
+ fm2ML <- lmer(diameter ~ 1 + (1|plate) + (1|sample), Penicillin, REML=0)
+ VarCorr(fm2ML)
+ 
+ gm1 <- glmer(cbind(incidence,size-incidence) ~ period + (1|herd),data=cbpp,
+              family=binomial)
+ VarCorr(gm1)
+ 
+ cbpp$obs <- factor(seq(nrow(cbpp)))
+ gm2 <- update(gm1,.~.+(1|obs))
+ VarCorr(gm2)
+ 
+ if (FALSE) {
+   ## testing lme4/lme4 incompatibility
+ ##  library(lme4)
+   VarCorr(fm1)
+   lme4:::VarCorr.merMod(fm1) ## OK
+ }
+ } ## skip on windows (for speed)
> 
> proc.time()
   user  system elapsed 
   1.39    0.12    1.50