On 06/06/2020 3:44 p.m., Duncan Murdoch wrote:
On 06/06/2020 3:06 p.m., Dirk Eddelbuettel wrote:
 ... [deletions]
In short, 4.0.0 no longer exports via 'exportPattern("^[[:alpha:]]+")'
rendering the new package created non-functional.

Was this intentional, or is this a bug we can look into fixing for R 4.0.2 ?

It's in the NEWS, so I'd assume it was intentional:

   - package.skeleton() now explicitly lists all exports in the
‘NAMESPACE’ file.

An earlier version of that message even showed up in the link you posted.

Something else in that link is presented more obviously in the svn log entry:

r76945 | hornik | 2019-08-10 04:13:48 -0400 (Sat, 10 Aug 2019) | 1 line
Changed paths:
   M /trunk/doc/NEWS.Rd
   M /trunk/src/library/utils/R/package.skeleton.R

Have package.skeleton() explicitly list all exports.

This change happened in August, 2019, about 10 months ago. Perhaps this message asking people to test R-devel is relevant:

https://stat.ethz.ch/pipermail/r-devel/2020-May/079484.html

Duncan Murdoch

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