The generic function stream-file-position implements file-position.
stream-file-position is called when file-position is called with one argument.
(setf stream:stream-file-position) is called when file-position is called with two arguments.
The return value is returned by file-position. For the setf function, this is a slight anomaly because setf functions normally return the new value. However in this case it should return the success-p value mandated by the ANSI Common Lisp standard.
The default methods specialized on stream return nil.
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