R-devel internal errors during check produce?

Jan Gorecki writes:

Thank you both,
You are absolutely correct that example should be minimal, so here it is.

l = list(a=new.env(), b=new.env())
unique(l)

Just for completeness, env_list during check that raises error

env_list <- list(baseenv(),
  as.environment("package:graphics"),
  as.environment("package:stats"),
  as.environment("package:utils"),
  as.environment("package:methods")
)
unique(env_list)

Best regards,
Jan

On Mon, Jun 29, 2020 at 5:42 PM Martin Maechler
<maechler at stat.math.ethz.ch> wrote:

Kurt Hornik
    on Mon, 29 Jun 2020 16:13:03 +0200 writes:

Jan Gorecki writes:

So the unique.default is from the R tools package during
checks.  I don't see those issues on CRAN checks.

I cannot reproduce this locally (and have no clues about
docker).  Perhaps you can try to debug this on your end?
And see what env_list is when the error occurs?

Best -k

Indeed, if it is a bug in R (as opposed to being an assumption
that 'data.table' makes about undocumented R internals), it
should be reproducible with a very small dummy package instead
of data.table. ... or actually reproducible with relatively
simple R code calling unique() not envolving any non base package.

Martin

Exact environment where I am reproducing this issue is a
fresh ubuntu, no R packages pre-installed docker pull
registry.gitlab.com/jangorecki/dockerfiles/r-devel
https://gitlab.com/jangorecki/dockerfiles/-/raw/master/r-devel/Dockerfile

On Sat, Jun 27, 2020 at 12:37 AM Jan Gorecki
<j.gorecki at wit.edu.pl> wrote:

Hi R developers,

On R-devel (2020-06-24 r78746) I am getting those two
new exceptions during R check. I found a change which
eventually may be related
https://github.com/wch/r-source/commit/69de92b9fb1b7f2a7c8d1394b8d56050881a5465
I think this may be a regression. I grep'ed package
manuals and R code for unique.default but don't see
any. Usage section of the unique method looks fine as
well. Errors look a little bit like internal errors.

* checking Rd \usage sections ... NOTE Error in
unique.default(env_list) : LENGTH or similar applied to
environment object Calls: <Anonymous>
... .get_S3_generics_as_seen_from_package -> unique ->
unique.default Execution halted The \usage entries for
S3 methods should use the \method markup and not their
full name.  * checking S3 generic/method consistency
... WARNING Error in unique.default(env_list) : LENGTH
or similar applied to environment object Calls:
<Anonymous> ... .get_S3_generics_as_seen_from_package ->
unique -> unique.default

I don't think if it is related but I build R-devel with
extra args: --with-recommended-packages
--enable-strict-barrier --disable-long-double I check
with: --as-cran --no-manual To reproduce download
current data.table from CRAN (1.12.8) and run R check

Best regards, Jan Gorecki