These are all file names in directory DIRECTORY which begin with FILE.
This function ignores some of the possible completions as determined
-by the variables `completion-regexp-list' and
-`completion-ignored-extensions', which see. `completion-regexp-list'
+by `completion-regexp-list', which see. `completion-regexp-list'
is matched against file and directory names relative to DIRECTORY. */)
(Lisp_Object file, Lisp_Object directory)
{