No error report for functions moved to another file.

[twlz0ne]

For example, there is an error report for cl-caaar:

(with-temp-buffer
  (insert ";; Package-Requires: ((emacs \"24.1\"))"
          "\n(cl-caaar nil)")
  (let ((report (package-lint-buffer)))
    (and (= 5 (length report))
         (car (reverse report)))))
;; => (2 1 error "You should depend on (emacs \"24.3\") or the cl-lib package if you need `cl-caaar'.")

But no error report for caaar which moved from cl.el to subr.el:

(with-temp-buffer
  (insert ";; Package-Requires: ((emacs \"24.1\"))"
          "\n(caaar nil)")
  (let ((report (package-lint-buffer)))
    (and (= 5 (length report))
         (car (reverse report)))))
;; => nil

https://emba.gnu.org/emacs/emacs/commit/43eba4955350b787c5567a31e2980ae70b9fb52f

Move cXXXr and cXXXXr to subr.el

• etc/NEWS: Mention new core Elisp.
• doc/lispref/lists.texi (List Elements): Document and index the new
  functions.
• doc/misc/cl.texi (List Functions): Change "defines" to "aliases".
• lisp/subr.el (caaar, caadr, cadar, caddr, cdaar, cdadr, cddar)
  (cdddr, caaaar caaadr, caadar, caaddr, cadaar, cadadr, caddar):
  (cadddr, cdaaar, cdaadr, cdadar, cdaddr, cddaar, cddadr, cdddar):
  (cddddr): New functions.
• lisp/emacs-lisp/cl-lib.el (cl-caaar, cl-caadr, cl-cadar, cl-caddr):
  (cl-cdaar, cl-cdadr, cl-cddar cl-cdddr, cl-caaaar cl-caaadr):
  (cl-caadar, cl-caaddr, cl-cadaar, cl-cadadr, cl-caddar, cl-cadddr):
  (cl-cdaaar, cl-cdaadr, cl-cdadar, cl-cdaddr, cl-cddaar, cl-cddadr):
  (cl-cdddar, cl-cddddr): Alias to new subr functions.
• lisp/emacs-lisp/cl.el (cl-unload-function): Remove cXXXr and cXXXXr
  elements.

[purcell]

Regarding detection of symbols that have moved from one file to another, this is very hard to do in the general case. See #109 for another example. In general package-lint doesn't check that you require the right files in order to obtain the specific symbols you want to use.

That said, the example behaviour you've pasted above look fine to me, since caaar was present in all Emacs >= 24.1. What am I missing?

[twlz0ne]

That said, the example behaviour you've pasted above look fine to me

Check out this: https://repl.it/repls/CoolMediumblueDriverwrapper

since caaar was present in all Emacs >= 24.1.

caaar moved from cl.el to subr.el since 26.1.

[purcell]

caaar moved from cl.el to subr.el since 26.1.

Yes, but it was present in older Emacsen too.

I'm having trouble understanding this issue, sorry. What error message are you expecting package-lint to produce?

[twlz0ne]

I'm having trouble understanding this issue, sorry

If I use caaar (or other moved) function in code for older Emacs, I need to require the cl (or other) package. But I may not notice it, because I am using 26.3 or newer for editing. So, I wonder if pakcage-lint can detect the problem.

[purcell]

Ah, right, thanks for the explanation. Yes, I can see the gap in warnings. That would be a hard case to detect. One thing we could do for such functions would be to consistently suggest cl-caaar etc. instead of caaar.