file-[not-]exists?

[shriram@cs.rice.edu (Shriram Krishnamurthi)]

Page 32 of the scsh manual reports the following return values:

file-not-exists?

    #t                doesn't exist
    #f                exists
    'search-denied    unable to determine

and claims that file-exists? is implemented as the not of
file-not-exists?.

One would have preferred that the 'search-denied flag be propagated to
file-exists? too.  It isn't clear that merging definite non-existence
with inability to determine existence is a win.  This asymmetry seems
a little odd.