[Rd] Check R version dependency in R CMD Check

[Jan Netík]

Hello,

I have a server with R 3.6.3 installed and I struggled a bit with
updating several R packages that utilizes some new syntax introduced in R
4.1.0, such as the native pipe |> or function definition shorthand \(x) ...

The thing is that these packages states "Depends: R (>= 3.6.0)" and pass R
CMD Check without any issues. My problem occurred at the installation time.
I can see that developers naturally include the new handy syntax but
oftentimes forget to raise R version dependency in their DESCRIPTIONs.
Should we employ some new checks?

Best,
Jan

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