R Under development (unstable) (2023-11-03 r85470 ucrt) -- "Unsuffered Consequences"
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> library(lme4)
Loading required package: Matrix
> 
>  ## setup
>  ## library(polytomous)
>  ##   data(think)
>  ##   think.polytomous.lmer1 <-  polytomous(Lexeme ~ Agent + Patient + (1|Register),
>  ##                                         data=think, heuristic="poisson.reformulation")
>  ##   save("formula.poisson","data.poisson",file="polytomous_test.RData")
> 
> load(system.file("testdata","polytomous_test.RData",package="lme4"))
> 
> if (FALSE) {
+     ## infinite loop
+     glmer(formula.poisson,data=data.poisson,family=poisson,verbose=10)
+     ## Cholmod not positive definite -> infinite loop
+     glmer(formula.poisson,data=data.poisson,family=poisson,
+           verbose=10,control=glmerControl(optimizer="bobyqa"))
+     ## caught warning: maxfun < 10 * length(par)^2 is not recommended. -> infinite loop
+ }
> ## works but sloooow ....
> if (FALSE) {
+     try(g1 <- glmer(formula.poisson,data=data.poisson,family=poisson,
+                     control=glmerControl(compDev=FALSE),verbose=1))
+     ## runs for 2880 steps until:
+     ## Error in pp$updateDecomp() : Downdated VtV is not positive definite
+ }
> 
> (testLevel <- lme4:::testLevel())
[1] 1
> if (testLevel > 2) {
+     glmer(formula.poisson,data=data.poisson,family=poisson,
+           control=glmerControl(compDev=FALSE,optimizer="bobyqa"))
+     ## caught warning: maxfun < 10 * length(par)^2 is not recommended.
+     ## but runs to completion
+ }
> 
> 
> 
> 
> 
> proc.time()
   user  system elapsed 
   1.23    0.07    1.25