R devel - Feb 2010 - filenames with special characters in the R/ directory of a package?

According to R-exts.pdf (page 3):
For maximal portability filenames should only
contain only ASCII characters not excluded already (that is
A-Za-z0-9._!#$%&+,;=@^(){}?[]

I have some files with special characters like '[' and '%' e.g.
'[.set.R'. I also have some functions that also have those special
characters defined in those files exported in NAMESPACE.

I use the following command to install. And I get no warning or errors.

R CMD INSTALL -d -l my_custom_dir my.pkg

I then load the package. I get the following errors and warnings. I
changed a file to one without these special characters. Then the
corresponding warning/error disappears. Is it the case that there
should never be files with special characters as names?
> library(my.pkg)
Error in namespaceExport(ns, exports) :
 undefined exports: %is%
In addition: Warning message:
S3 methods ?[.set? were declared in NAMESPACE but not found
Error: package/namespace load failed for 'my.pkg'

On Fri, Feb 12, 2010 at 5:35 AM, blue sky <bluesky315 at gmail.com>
wrote:
> According to R-exts.pdf (page 3):
> For maximal portability filenames should only
> contain only ASCII characters not excluded already (that is
> A-Za-z0-9._!#$%&+,;=@^(){}?[]
>
> I have some files with special characters like '[' and '%'
e.g.
> '[.set.R'.
That character list in your extract from R-exts.pdf is a list of
non-special characters. And [ and % are in there.

 It's clarification of three sentences previous, which says:

"the characters ?"?, ?*?, ?:?, ?/?, ?<?, ?>?, ???, ?\?, and ?|?
are
not allowed in file names"
> I also have some functions that also have those special
> characters defined in those files exported in NAMESPACE.
>
> I use the following command to install. And I get no warning or errors.
>
> R CMD INSTALL -d -l my_custom_dir my.pkg
>
> I then load the package. I get the following errors and warnings. I
> changed a file to one without these special characters. Then the
> corresponding warning/error disappears. Is it the case that there
> should never be files with special characters as names?
>
>> library(my.pkg)
> Error in namespaceExport(ns, exports) :
> ?undefined exports: %is%
> In addition: Warning message:
> S3 methods ?[.set? were declared in NAMESPACE but not found
> Error: package/namespace load failed for 'my.pkg'
 Have you done an R CMD check on your package? I suspect a problem in
your NAMESPACE file, but it's not related to "special characters".

Barry