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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: |
Sun, 04 Jun 2023 08:31:58 +0300 |
> 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)))))))