This file is indexed.

/usr/lib/R/site-library/checkmate/INDEX is in r-cran-checkmate 1.6.0-1.

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

The actual contents of the file can be viewed below.

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allMissing              Check if an object contains missing values
anyInfinite             Check if an object contains infinte values
asInteger               Convert an argument to an integer
assert                  Combine multiple checks into one assertion
checkAccess             Check file system access rights
checkArray              Check if an argument is an array
checkAtomic             Check that an argument is an atomic vector
checkAtomicVector       Check that an argument is an atomic vector
checkCharacter          Check if an argument is a vector of type
                        character
checkChoice             Check if an object is an element of a given set
checkClass              Check argument inheritance
checkComplex            Check if an argument is a vector of type
                        complex
checkCount              Check if an argument is a count
checkDataFrame          Check if an argument is a data frame
checkDirectory          Check for existence and access rights of
                        directories
checkEnvironment        Check if an argument is an environment
checkFactor             Check if an argument is a factor
checkFile               Check existence and access rights of files
checkFlag               Check if an argument is a flag
checkFunction           Check if an argument is a function
checkInt                Check if an argument is a single integerish
                        value
checkInteger            Check if an argument is vector of type integer
checkIntegerish         Check if an object is an integerish vector
checkList               Check if an argument is a list
checkLogical            Check if an argument is a vector of type
                        logical
checkMatrix             Check if an argument is a matrix
checkNamed              Check if an argument is named
checkNames              Check names to comply to specific rules
checkNull               Check if an argument is NULL
checkNumber             Check if an argument is a single numeric
checkNumeric            Check that an argument is a vector of type
                        numeric
checkPathForOutput      Check file path for later output
checkPercentage         Check if an argument is a percentage
checkScalar             Check if an argument is a single atomic value
checkScalarNA           Check if an argument is a single missing value
checkSetEqual           Check if object is a subset of a given set
checkString             Check if an argument is a string
checkSubset             Check if object is a subset of a given set
checkVector             Check if an argument is a vector
checkmate               The checkmate package
qassert                 Quick argument checks on (builtin) R types
qassertr                Quick recursive arguments checks on lists and
                        data frames