6.2 The Source File Recording Facility

6.2.2 Source file recording examples

The following examples illustrate the effects of source file recording on redefinition warnings.

;;; Suppose the files "file-a.lisp" and "file-b.lisp" both 
;;; contain definitions of the function DOIT.

;; Loading "file-a" defines DOIT for the first time.
> (load "file-a")
;;; Loading source file "file-a.lisp"
#P"/u/kdo/file-a.lisp"

;; Now, loading "file-b", which also defines DOIT, produces a
;; warning.
> (load "file-b")
;;; Loading source file "file-b.lisp"
;;; Warning: Redefining function DOIT which used to be defined in 
;;; "/u/kdo/file-a.lisp"
#P"/u/kdo/file-b.lisp"

;; Reloading the same file produces no warning.
> (load "file-b")
;;; Load source file "file-b.lisp".
#P"/u/kdo/file-b.lisp"

;; Get the pathname of the source file.
> (get-source-file 'doit)
#P"/u/kdo/file-b.lisp"

The Advanced User's Guide - 9 SEP 1996

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