Nothing
## copied from tools:::.extract_dependency_package_names to avoid check NOTE.
## seems pretty simple and safe
extract_dep_pkg_names = function (x)
{
if (is.na(x))
return(character())
x <- unlist(strsplit(x, ",[[:space:]]*"))
x <- sub("[[:space:]]*([[:alnum:].]+).*", "\\1", x)
x[nzchar(x) & (x != "R")]
}
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