@itemize
@item
Some systems mistakenly succeed on @code{unlink("link-to-file/")}:
-GNU/Hurd, FreeBSD 7.2, Solaris 9.
+GNU/Hurd, FreeBSD 7.2, AIX 7.1, Solaris 9.
@item
On MacOS X 10.5.6, in a writable HFS mount, @code{unlink("..")} succeeds
without doing anything.