R Under development (unstable) (2023-11-02 r85465 ucrt) -- "Unsuffered Consequences"
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> if (.Platform$OS.type != "windows") withAutoprint({
+     library(lme4)
+ 
+     fm1 <- lmer(Reaction ~ Days + (Days|Subject), sleepstudy)
+ 
+     ## slightly weird model but plausible --- not that
+     ##   one would want to try drop1() on this model ...
+     fm2 <- lmer(Reaction ~ 1+ (Days|Subject), sleepstudy)
+     drop1(fm2)  ## empty
+     update(fm1, . ~ . - Days)
+     anova(fm2) ## empty
+ 
+     terms(fm1)
+     terms(fm1,fixed.only=FALSE)
+ 
+     extractAIC(fm1)
+ 
+     drop1(fm1)
+     drop1(fm1, test="Chisq")
+ 
+     gm1 <- glmer(cbind(incidence, size - incidence) ~ period + (1 | herd),
+                  family = binomial, data = cbpp, nAGQ=25L)
+ 
+     drop1(gm1, test="Chisq")
+ 
+ }) ## skip on windows (for speed)
> 
> proc.time()
   user  system elapsed 
   0.21    0.04    0.25