/usr/lib/R/site-library/memoise/INDEX is in r-cran-memoise 1.0.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 | forget                  Forget past results. Resets the cache of a
                        memoised function.
has_cache               Test whether a memoised function has been
                        cached for particular arguments.
is.memoised             Test whether a function is a memoised copy.
                        Memoised copies of functions carry an attribute
                        'memoised = TRUE', which is.memoised() tests
                        for.
memoise                 Memoise a function.
timeout                 Return a new number after a given number of
                        seconds
 |