[Rd] DESCRIPTION: Imports: assertion of version?

Seth Falcon seth at userprimary.net
Fri Mar 19 21:44:42 CET 2010

On 3/19/10 6:13 AM, Henrik Bengtsson wrote:
> Hi,
> from 'Writing R Extensions' [R version 2.11.0 Under development
> (unstable) (2010-03-16 r51290)] one can read:
> "The optional `Imports' field lists packages whose name spaces are
> imported from but which do not need to be attached. [...] Versions can
> be specified, but will not be checked when the namespace is loaded."
> Is it a design decision that version specifications are not asserted
> for packages under "Imports:", or is it a "lack of implementation"?
> If a design decision, under what use cases do you want to specify the
> version but not validating it?  Is it simply because there is no
> mechanism for tracking the origin/package of the code importing the
> other package, and hence we cannot know which DESCRIPTION file to
> check against?

I'm not aware of any use case in which the current lack of checking is a 
"feature".  I would be interested in a patch (with testing) for this.

+ seth

Seth Falcon | @sfalcon | http://userprimary.net/

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