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bug#63881: 29.0.91; apropos-documentation fails when load-history contai
From: |
Eli Zaretskii |
Subject: |
bug#63881: 29.0.91; apropos-documentation fails when load-history contains element whose CAR is nil |
Date: |
Sat, 10 Jun 2023 12:25:49 +0300 |
> Cc: 63881@debbugs.gnu.org
> Date: Sun, 04 Jun 2023 08:31:58 +0300
> From: Eli Zaretskii <eliz@gnu.org>
>
> > From: Visuwesh <visuweshm@gmail.com>
> > Date: Sun, 04 Jun 2023 08:37:08 +0530
> >
> >
> > As per (info "(elisp) Where Defined"), load-history may contain an
> > element whose CAR is nil if eval-buffer was used to evaluate a defun
> > in a non-file-visiting buffer.
> >
> > After such an entry is added to load-history, apropos-documentation
> > fails with the backtrace at end.
>
> How did you add such an entry to load-history? IOW, is there a
> real-life use case where this happens?
>
> > To reproduce the issue,
> >
> > 1. emacs -Q
> > 2. Insert (defun test () t)
> > 3. M-x eval-buffer RET
> > 4. Confirm that a nil entry is present in load-history by evaluating
> > (alist-get nil load-history 'none)
> > 5. C-h d any RET
> >
> > The problem lies in apropos--map-preloaded-atoms in the part
> >
> > (dolist (x load-history)
> > (when (string-match preloaded-regexp (car x))
> > ^^^^^^^^
> > (dolist (def (cdr x))
> > (cond
> > ((symbolp def) (funcall f def))
> > ((eq 'defun (car-safe def)) (funcall f (cdr def)))))))))
> >
> >
> > ----
> >
> >
> > Debugger entered--Lisp error: (wrong-type-argument stringp nil)
> > string-match("\\`/home/viz/lib/ports/emacs/lisp/\\(?:abbrev\\|b\\(?:..."
> > nil)
> > (if (string-match preloaded-regexp (car x)) (progn (let ((tail (cdr x)))
> > (while tail (let ((def (car tail))) (cond ((symbolp def) (funcall f def))
> > ((eq ... ...) (funcall f ...))) (setq tail (cdr tail)))))))
Stefan, does the below look good for emacs-29?
diff --git a/lisp/apropos.el b/lisp/apropos.el
index 5d7fe69..c9551b0 100644
--- a/lisp/apropos.el
+++ b/lisp/apropos.el
@@ -900,7 +900,8 @@ apropos--map-preloaded-atoms
;; state of the `obarray' when we dumped, which we may also be able to
;; use in `bytecomp' to provide a clean initial environment?)
(dolist (x load-history)
- (when (string-match preloaded-regexp (car x))
+ (when (let ((elt (car x)))
+ (and (stringp elt) (string-match preloaded-regexp elt)))
(dolist (def (cdr x))
(cond
((symbolp def) (funcall f def))