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ANSI Common Lisp  19 Filenames 19.2 Pathnames 19.2.3 Merging Pathnames
19.2.3.1 Examples of Merging Pathnames
Although the following examples are possible to execute only in
implementations which permit :unspecific in the indicated
position andwhich permit four-letter type components, they serve to illustrate
the basic concept of pathname merging.
(pathname-type
(merge-pathnames (make-pathname :type "LISP")
(make-pathname :type "TEXT")))
 "LISP"
(pathname-type
(merge-pathnames (make-pathname :type nil)
(make-pathname :type "LISP")))
"LISP"
(pathname-type
(merge-pathnames (make-pathname :type :unspecific)
(make-pathname :type "LISP")))
:UNSPECIFIC
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