This file is indexed.

/usr/lib/R/site-library/assertthat/INDEX is in r-cran-assertthat 0.1-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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are_equal               Are two objects equal?
assert_that             Assert that certain conditions are true.
assertions-file         Useful test related to files
has_args                Check a function has specified arguments
has_attr                Has attribute or name?
is.count                Assert input is a scalar.
is.date                 Missing is functions.
noNA                    Does object contain any missing values?
not_empty               Check an object doesn't have any empty
                        dimensions
on_failure              Custom failure messages for assertions.
validate_that           Validate that certain conditions are true.