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R has thousands of "packages" which provide optional functionality. Packages are published on CRAN, which runs a standard set of checks on the most recent version of each package. Packages are removed from CRAN if they do not pass all of the checks, and the maintainer does not fix the problems after having been altered to them.

In this task you should first find a CRAN package which does not have checks passing (on at least one platform). To do that you can look at the CRAN check results pages, e.g.

• https://cloud.r-project.org/web/checks/check_results_re2r.html
• https://cloud.r-project.org/web/checks/check_results_Segmentor3IsBack.html

After that, your job is to find the cause of the problem, fix it, and submit your fix as a pull request to the development repo of the package (which is typically listed in the URL field of the DESCRIPTION file of the package). For example if you fix an issue in re2r you should submit a pull request to https://github.com/qinwf/re2r

If you need more information about how the package works / how to write the fix, you are encouraged to write an email to the maintainer of the package in question (listed in the Maintainer field of the DESCRIPTION file).