pathname-version

(pathname-version pathname)

The version component of a pathname -- always nil here, for the reason pathname-host is: rontolisp has no file versions, so no namestring can carry one.

Deviation: SBCL answers :newest for a pathname it PARSED from a namestring and nil for one make-pathname built. nil -- "the component is not present" -- is the one answer that is true of every pathname here.

Backend support

All four backends -- one definition in rontolisp source over primitives every backend has.