Leaking warning triggers on R-devel post Nov 1st

[coatless]

From the R-devel build on Wed, 01 Nov 23:

‘warnings()’ now always inherits from ‘"warnings"’ as documented, newly also in the case of no warnings, where it previously returned ‘NULL’.

This is causing empty warnings to be triggered on the r-devel check

CRAN R-Devel Checks

Version: 0.1.1
Check: whether startup messages can be suppressed
Result: NOTE
    Please type into your browser:
    https://google.com/search?q=Warning%20messages:%0A%20r%20programming
    
    It looks like this package (or a package it requires) has a startup
    message which cannot be suppressed: see ?packageStartupMessage.
Flavors: [r-devel-linux-x86_64-debian-clang](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-clang/errorist-00check.html), [r-devel-linux-x86_64-debian-gcc](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-gcc/errorist-00check.html), [r-devel-linux-x86_64-fedora-clang](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-fedora-clang/errorist-00check.html), [r-devel-linux-x86_64-fedora-gcc](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-fedora-gcc/errorist-00check.html), [r-devel-windows-x86_64](https://www.r-project.org/nosvn/R.check/r-devel-windows-x86_64/errorist-00check.html)

Version: 0.1.1
Check: for missing documentation entries
Result: WARN
    Please type into your browser:
    https://google.com/search?q=Warning%20messages:%0A%20r%20programming
    All user-level objects in a package should have documentation entries.
    See chapter ‘Writing R documentation files’ in the ‘Writing R
    Extensions’ manual.
Flavors: [r-devel-linux-x86_64-debian-clang](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-clang/errorist-00check.html), [r-devel-linux-x86_64-debian-gcc](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-gcc/errorist-00check.html), [r-devel-linux-x86_64-fedora-clang](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-fedora-clang/errorist-00check.html), [r-devel-linux-x86_64-fedora-gcc](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-fedora-gcc/errorist-00check.html), [r-devel-windows-x86_64](https://www.r-project.org/nosvn/R.check/r-devel-windows-x86_64/errorist-00check.html)

Version: 0.1.1
Check: for code/documentation mismatches
Result: WARN
    Please type into your browser:
    https://google.com/search?q=Warning%20messages:%0A%20r%20programming
    Please type into your browser:
    https://google.com/search?q=Warning%20messages:%0A%20r%20programming
    Please type into your browser:
    https://google.com/search?q=Warning%20messages:%0A%20r%20programming
Flavors: [r-devel-linux-x86_64-debian-clang](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-clang/errorist-00check.html), [r-devel-linux-x86_64-debian-gcc](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-debian-gcc/errorist-00check.html), [r-devel-linux-x86_64-fedora-clang](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-fedora-clang/errorist-00check.html), [r-devel-linux-x86_64-fedora-gcc](https://www.r-project.org/nosvn/R.check/r-devel-linux-x86_64-fedora-gcc/errorist-00check.html), [r-devel-windows-x86_64](https://www.r-project.org/nosvn/R.check/r-devel-windows-x86_64/errorist-00check.html)

[coatless]

From Kurt, he suggested switching:

errorist/R/handlers.R

Line 116 in 6c27c91

if (!is.null(last_warning_value)) {

To:

    if (!length(last_warning_value)) {

However, we're still seeing similar errors being triggered. More deeper investigation is required.