It's the unix semantics of readdir(); e.g. specified in Single Unix:
`` The type DIR, which is defined in the header <dirent.h>, represents
a directory stream, which is an ordered sequence of all the
directory entries in a particular directory. Directory entries
represent files; files may be removed from a directory or added to
a directory asynchronously to the operation of readdir(). ''
An ordered sequence does not include cycles.
*Who* says NFS has to be a *unix* like filesystem?
--cw
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