R Under development (unstable) (2023-12-07 r85661 ucrt) -- "Unsuffered Consequences"
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> library(bbmle)
Loading required package: stats4
> old_opt <- options(digits=3)
> x <- 0:10
> y <- c(26, 17, 13, 12, 20, 5, 9, 8, 5, 4, 8)
> d <- data.frame(x,y)
> 
> 
> ## throws warning on some CRAN system (BDR report 2019-12-20)
> ## /tests-noLD/bbmle.Rcheck’
> ## * using R Under development (unstable) (2019-12-19 r77606)
> ## * using platform: x86_64-pc-linux-gnu (64-bit)
> ## suppressWarnings() doesn't seem to suppress the warning??
> ## instead use test from https://www.r-bloggers.com/a-nold-platform-on-r-hub-package-builder/
> if (capabilities("long.double")) {
+    fit0 <- suppressWarnings(
+     mle2(y~dpois(lambda=ymean),start=list(ymean=mean(y)),data=d,
+          method="L-BFGS-B",lower=10)
+    )
+    stopifnot(is.na(confint(fit0)[1]))
+ }
> 
> fit1 <- mle2(y~dpois(lambda=exp(a+b*x)),start=list(a=0,b=2),data=d,
+              method="L-BFGS-B",lower=-0.2)
> 
> suppressWarnings(confint(fit1))
  2.5 %  97.5 %
a  2.81  3.3579
b    NA -0.0944
> 
> fit2 <- mle2(y~dpois(lambda=exp(a+b*x)),start=list(a=0,b=2),data=d,
+              method="L-BFGS-B")
> 
> pp <- profile(fit2,prof.lower=-0.2)
> stopifnot(min(subset(as.data.frame(pp),param=="b")$par.vals.b)==-0.2)
> ## note that b does go below -0.2 when profiling a ...
> options(old_opt)
> 
> proc.time()
   user  system elapsed 
   1.65    0.20    1.79