[Rd] R CMD check and CRAN's Rust policy

[Tim Taylor]

> To Tim's comment—the check is a simple grep of the installation log for
> "Downloading crates." This could be easily circumvented on CRAN and locally
> by suppressing stdout/err. But that would be adversarial and I would like
> to adhere to the intent of the check.

Josiah - I do sympathise but, irrespective of this particular check, this highlights an inflexibility in your CI setup to handle different warnings as you wish. It is not adversarial to not fail on a warning produced by R CMD check, within your own CI.