Without rust/library/, libc, and winapi-rs:

    $ grep -irn 'unsafe {\|unsafe fn' . | wc -l
    1780

Without rust/library/:

    $ grep -irn 'unsafe {\|unsafe fn' . | wc -l
    1937

With rust/library/ (and libc, and winapi-rs):

    $ grep -irn 'unsafe {\|unsafe fn' . | wc -l
    5612