/usr/share/doc/ is in r-cran-backports 1.1.1-1.
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/usr/share/doc/r-cran-backports/
/usr/share/doc/r-cran-backports/README.test
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/usr/share/doc/r-cran-backports/copyright
/usr/share/doc/r-cran-backports/run-unit-test
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/usr/share/doc/r-cran-backports/tests/test_get0.R
/usr/share/doc/r-cran-backports/tests/test_hasName.R
/usr/share/doc/r-cran-backports/tests/test_isFALSE.R
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/usr/share/doc/r-cran-backports/tests/test_startsWith.R
/usr/share/doc/r-cran-backports/tests/test_strrep.R
/usr/share/doc/r-cran-backports/tests/test_trimws.R