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There are many aspects of ANSI Common Lisp's pathname support which are implementation-defined and so need documentation.
The logical pathname host named by "SYS" exists in SBCL. Its
logical-pathname-translations may be set by the site or the user
applicable to point to the locations of the system's sources; in
particular, the core system's source files match the logical pathname
"SYS:SRC;**;*.*.*", and the contributed modules' source files
match "SYS:CONTRIB;**;*.*.*".