[R-pkg-devel] Checkpoint package failing CRAN checks

I wonder why does vignettes/checkpoint.Rmd run the following:

example_project <- tempdir()

Now example_project contains the path of per-session temporary
directory...

dir.create(example_project, recursive = TRUE, showWarnings = FALSE)

...so there should be no need to create it...

unlink(example_project, recursive = TRUE)

And deleting it is might be the cause of the problems: rmarkdown
probably uses the same temporary directory to store its own files.

Perhaps example_project should be something like tempfile(project)
instead of just tempdir()? Then dir.create() and unlink() calls start
making sense.

Best regards,
Ivan