[Rd] Control statements with condition with greater than one should give error (not just warning) [PATCH]

[Hadley Wickham]

> But, how you propose a warning-to-error transition should be made
> without wreaking havoc?  Just flip the switch in R-devel and see CRAN
> and Bioconductor packages break overnight?  Particularly Bioconductor
> devel might become non-functional (since at times it requires
> R-devel).  For my own code / packages, I would be able to handle such
> a change, but I'm completely out of control if one of the package I'm
> depending on does not provide a quick fix (with the only option to
> remove package tests for those dependencies).

Generally, a package can not be on CRAN if it has any warnings, so I
don't think this change would have any impact on CRAN packages.  Isn't
this also true for bioconductor?

Hadley

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