[Rd] Strange warnings when unloading packages with S4 classes

[Winston Chang]

Excellent, thanks.

-Winston

On Thu, Dec 19, 2013 at 1:22 PM, John Chambers <jmc at r-project.org> wrote:
> Previously reported and fixed in 3.0.2-patched (Bug 15481).  Unless there is a 3.0.3, you will have to wait for 3.1.0.
>
> On Dec 19, 2013, at 10:19 AM, Winston Chang <winstonchang1 at gmail.com> wrote:
>
>> I've been seeing warnings when unloading packages. They can be seen with
>> the shiny and sp packages, among others (this is on R 3.0.2). For example:
>>> library(sp)
>>> unloadNamespace('sp')
>> Warning messages:
>> 1: In FUN(X[[2L]], ...) :
>>  Created a package name, ‘2013-12-19 12:14:24’, when none found
>> 2: In FUN(X[[2L]], ...) :
>>  Created a package name, ‘2013-12-19 12:14:24’, when none found
>> 3: In FUN(X[[2L]], ...) :
>>  Created a package name, ‘2013-12-19 12:14:24’, when none found
>> 4: In FUN(X[[2L]], ...) :
>>  Created a package name, ‘2013-12-19 12:14:24’, when none found
>>
>> It appears to be related to the methods:::.removeSuperclassBackRefs
>> function.
>>
>>
>> I can get the warnings to appear when the following are both true:
>> * The package has an S4 class which inherits from a class outside of the
>> package.
>> * The NAMESPACE file contains import(methods)
>>
>> I've created some very simple test packages here which illustrate the
>> problem, along with instructions on how to duplicate the warning.
>> https://github.com/wch/s4unload
>>
>> The warnings only appear when unloading the package where both of the
>> conditions above are true. I'm not sure why import(methods) should make a
>> difference, but it does.
>>
>> Is this a bug in the implementation of S4?
>>
>> Best,
>> -Winston
>>
>>       [[alternative HTML version deleted]]
>>
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>