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| ANSI Common Lisp 19 Filenames 19.2 Pathnames ### 19.2.3 Merging Pathnames Merging takes a pathname with unfilled components and supplies values for those components from a source of defaults. If a component's value is nil, that component is considered to be unfilled. If a component's value is any non-nil object, including `:unspecific`, that component is considered to be filled. Except as explicitly specified otherwise, for functions that manipulate or inquire about files in the file system, the pathname argument to such a function is merged with *default-pathname-defaults* before accessing the file system (as if by merge-pathnames). 19.2.3.1 Examples of Merging Pathnames

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