A way to lose a file

The ln command from GNU coreutils warns when the source and the destination of the attempted hardlink are the same file, and does nothing:

$ echo 123 >testfile
$ ls -l testfile
--rw-r--r--  1 aep  aep  4 Dec  6 15:08 testfile
$ ln testfile testfile 
ln: creating hard link `testfile': File exists
$ ln -f testfile testfile 
ln: `testfile' and `testfile' are the same file
$ ls -l testfile
--rw-r--r--  1 aep  aep  4 Dec  6 15:08 testfile

Its counterpart from FreeBSD, however, doesn't warn. Instead, it erases the file.

$ echo 123 >testfile
$ ls -l testfile
--rw-r--r--  1 aep  aep  4 Dec  6 15:08 testfile
$ ln testfile testfile
ln: testfile: No such file or directory
$ ls -l testfile
ls: testfile: No such file or directory