Fix CRAN ERROR for (intended) error in vignette

[peterdesmet]

This vignette has a chunk to show that check_package() will return an (informative) error. The code chuck has the option error = TRUE allowing the vignette to ignore it and continue building.

But it seems to raise an ERROR on CRAN (which has check arguments '--no-clean-on-error '). I'm asking rOpenSci what is the best way to fix this.

[PietrH]

Oh, I didn't know about that! No idea on how to get around this, I'm interested to see what the best way to do this is

[peterdesmet]

Got an answer:

I think this is yihui/knitr#2338.
In short, try setting purl = FALSE in chunks with error = TRUE

Indeed, it is only the r-oldrel-macos checks that are failing on CRAN:

I added purl = FALSE, but we will only see the result if we release a patch to CRAN. For now, I'll wait.