R Under development (unstable) (2023-11-02 r85465 ucrt) -- "Unsuffered Consequences"
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> if (.Platform$OS.type != "windows") {
+     ## see if we can still run lme4 functions when lme4 is not attached
+     if ("package:lme4" %in% search()) detach("package:lme4")
+     data(sleepstudy,package="lme4")
+     data(cbpp,package="lme4")
+     fm1 <- lme4::lmer(Reaction ~ Days + (Days|Subject), sleepstudy)
+     gm1 <- lme4::glmer(cbind(incidence, size - incidence) ~ period + (1 | herd),
+                        data = cbpp, family = binomial)
+ } ## skip on windows (for speed)
> 
> proc.time()
   user  system elapsed 
   0.15    0.09    0.23