GNU bug report logs - #27371
26.0.50; Unexpected element (define-type . tramp-file-name) in load-history

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: bug-gnu-emacs <at> gnu.org
Subject: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Thu, 15 Jun 2017 10:05:31 +0200

1. emacs -Q -l tramp
2. M-x unload-feature <RET> tramp

=> Unexpected element (define-type . tramp-file-name) in load-history

In GNU Emacs 26.0.50 (build 44, x86_64-pc-linux-gnu, GTK+ Version 2.24.30)
 of 2017-03-31 built on detlef
Repository revision: 1da9a207669a3cf5d27ac1dd61543c1492e05360
System Description:	Ubuntu 17.04

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Message #14 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: 27371 <at> debbugs.gnu.org
Cc: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Mon, 17 Jul 2017 14:36:56 +0200

Michael Albinus <michael.albinus <at> gmx.de> writes:

> 1. emacs -Q -l tramp
> 2. M-x unload-feature <RET> tramp
>
> => Unexpected element (define-type . tramp-file-name) in load-history

The following patch fixes this for me:

--8<---------------cut here---------------start------------->8---
diff --git a/lisp/loadhist.el b/lisp/loadhist.el
index 28d0b18c81..34200ab40e 100644
--- a/lisp/loadhist.el
+++ b/lisp/loadhist.el
@@ -269,7 +269,7 @@ unload-feature
 	      ;; and says we should restore SYMBOL's autoload
 	      ;; when we undefine it.
 	      (`t (setq restore-autoload (cdr x)))
-	      ((or `require `defface) nil)
+	      ((or `require `defface `define-type) nil)
 	      (_ (message "Unexpected element %s in load-history" x)))
 	  ;; Kill local values as much as possible.
 	  (dolist (buf (buffer-list))
--8<---------------cut here---------------end--------------->8---

However, it just skips the entry. Wouldn't it be better to remove the
defstruct itself, and all inherited symbols? And where could I find
information how to destroy a defstruct?

Stefan?

Beswt regards, Michael.

Message #17 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 27371 <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Mon, 17 Jul 2017 15:43:52 -0400

> However, it just skips the entry. Wouldn't it be better to remove the
> defstruct itself, and all inherited symbols? And where could I find
> information how to destroy a defstruct?

Better would be to add some hook so cl-lib can add support for
define-type.


        Stefan

Message #20 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 27371 <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Tue, 18 Jul 2017 09:09:55 +0200

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

>> However, it just skips the entry. Wouldn't it be better to remove the
>> defstruct itself, and all inherited symbols? And where could I find
>> information how to destroy a defstruct?
>
> Better would be to add some hook so cl-lib can add support for
> define-type.

Likely yes. But I'm not familiar with cl*; I have no idea how such a
hook should look like. And how it shall be implemented.

>         Stefan

Best regards, Michael.

Message #23 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 27371 <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Tue, 18 Jul 2017 10:25:56 -0400

>>> However, it just skips the entry. Wouldn't it be better to remove the
>>> defstruct itself, and all inherited symbols? And where could I find
>>> information how to destroy a defstruct?
>> Better would be to add some hook so cl-lib can add support for
>> define-type.
> Likely yes. But I'm not familiar with cl*; I have no idea how such a
> hook should look like. And how it shall be implemented.

The hook shouldn't be specific to cl.  Maybe something like the patch
below would make sense?
Then we can add support for define-type, ert-deftest, cl-defmethod, ...


        Stefan


diff --git a/lisp/loadhist.el b/lisp/loadhist.el
index 28d0b18c81..bf15399c11 100644
--- a/lisp/loadhist.el
+++ b/lisp/loadhist.el
@@ -162,6 +162,60 @@ unload--set-major-mode
           ;; mode, or proposed is not nil and not major-mode, and so we use it.
           (funcall (or proposed 'fundamental-mode)))))))
 
+(cl-defgeneric loadhist-unload-element (x)
+  "Unload an element from the `load-history'."
+  (message "Unexpected element %S in load-history" x))
+
+;; In `load-history', the definition of a previously autoloaded
+;; function is represented by 2 entries: (t . SYMBOL) comes before
+;; (defun . SYMBOL) and says we should restore SYMBOL's autoload when
+;; we undefine it.
+;; So we use this auxiliary variable to keep track of the last (t . SYMBOL)
+;; that occurred.
+(defvar loadhist--restore-autoload
+  "If non-nil, this is a symbol for which we should
+restore a previous autoload if possible.")
+
+(cl-defmethod loadhist-unload-element ((x (head t)))
+  (setq loadhist--restore-autoload (cdr x)))
+
+(defun loadhist--unload-function (x)
+  (let ((fun (cdr x)))
+    (when (fboundp fun)
+      (when (fboundp 'ad-unadvise)
+	(ad-unadvise fun))
+      (let ((aload (get fun 'autoload)))
+	(defalias fun
+          (if (and aload (eq fun loadhist--restore-autoload))
+	      (cons 'autoload aload)
+            nil))))))
+  (setq loadhist--restore-autoload nil))
+
+(cl-defmethod loadhist-unload-element ((x (head defun)))
+  (loadhist--unload-function x))
+(cl-defmethod loadhist-unload-element ((x (head autoload)))
+  (loadhist--unload-function x))
+
+(cl-defmethod loadhist-unload-element ((x (head require))) nil)
+(cl-defmethod loadhist-unload-element ((x (head defface))) nil)
+
+(cl-defmethod loadhist-unload-element ((x (head provide)))
+  ;; Remove any feature names that this file provided.
+  (setq features (delq (cdr x) features)))
+
+(cl-defmethod loadhist-unload-element ((x symbol))
+  ;; Kill local values as much as possible.
+  (dolist (buf (buffer-list))
+    (with-current-buffer buf
+      (if (and (boundp x) (timerp (symbol-value x)))
+	  (cancel-timer (symbol-value x)))
+      (kill-local-variable x)))
+  (if (and (boundp x) (timerp (symbol-value x)))
+      (cancel-timer (symbol-value x)))
+  ;; Get rid of the default binding if we can.
+  (unless (local-variable-if-set-p x)
+    (makunbound x)))
+
 ;;;###autoload
 (defun unload-feature (feature &optional force)
   "Unload the library that provided FEATURE.
@@ -200,9 +254,6 @@ unload-feature
 	       (prin1-to-string dependents) file))))
   (let* ((unload-function-defs-list (feature-symbols feature))
          (file (pop unload-function-defs-list))
-	 ;; If non-nil, this is a symbol for which we should
-	 ;; restore a previous autoload if possible.
-	 restore-autoload
 	 (name (symbol-name feature))
          (unload-hook (intern-soft (concat name "-unload-hook")))
 	 (unload-func (intern-soft (concat name "-unload-function"))))
@@ -250,38 +301,7 @@ unload-feature
 	  (when (symbolp elt)
 	    (elp-restore-function elt))))
 
-      (dolist (x unload-function-defs-list)
-	(if (consp x)
-	    (pcase (car x)
-	      ;; Remove any feature names that this file provided.
-	      (`provide
-	       (setq features (delq (cdr x) features)))
-	      ((or `defun `autoload)
-	       (let ((fun (cdr x)))
-		 (when (fboundp fun)
-		   (when (fboundp 'ad-unadvise)
-		     (ad-unadvise fun))
-		   (let ((aload (get fun 'autoload)))
-		     (if (and aload (eq fun restore-autoload))
-			 (fset fun (cons 'autoload aload))
-		       (fmakunbound fun))))))
-	      ;; (t . SYMBOL) comes before (defun . SYMBOL)
-	      ;; and says we should restore SYMBOL's autoload
-	      ;; when we undefine it.
-	      (`t (setq restore-autoload (cdr x)))
-	      ((or `require `defface) nil)
-	      (_ (message "Unexpected element %s in load-history" x)))
-	  ;; Kill local values as much as possible.
-	  (dolist (buf (buffer-list))
-	    (with-current-buffer buf
-	      (if (and (boundp x) (timerp (symbol-value x)))
-		  (cancel-timer (symbol-value x)))
-	      (kill-local-variable x)))
-	  (if (and (boundp x) (timerp (symbol-value x)))
-	      (cancel-timer (symbol-value x)))
-	  ;; Get rid of the default binding if we can.
-	  (unless (local-variable-if-set-p x)
-	    (makunbound x))))
+      (mapc #'loadhist-unload-element unload-function-defs-list)
       ;; Delete the load-history element for this file.
       (setq load-history (delq (assoc file load-history) load-history))))
   ;; Don't return load-history, it is not useful.

Message #26 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 27371 <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Tue, 18 Jul 2017 17:19:21 +0200

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

Hi Stefan,

> The hook shouldn't be specific to cl.  Maybe something like the patch
> below would make sense?

There is an error in the patch:

In toplevel form:
loadhist.el:192:40:Error: Invalid read syntax: ")"

After fixing this, `tramp-test39-unload' still passes the test. You
might push the patch.

> Then we can add support for define-type, ert-deftest, cl-defmethod, ...

That's my original question: what does it take to unload a `define-type'
entry?

>         Stefan

Best regards, Michael.

Message #29 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 27371 <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Tue, 18 Jul 2017 11:56:18 -0400

>> Then we can add support for define-type, ert-deftest, cl-defmethod, ...
> That's my original question: what does it take to unload a `define-type'
> entry?

Presumably it should undo what cl-struct-define does.
The main part would be (setf (cl--find-class name) nil), I guess.


        Stefan

Message #32 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 27371 <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Tue, 18 Jul 2017 18:08:38 +0200

Michael Albinus <michael.albinus <at> gmx.de> writes:

Hi Stefan,

> After fixing this, `tramp-test39-unload' still passes the test. You
> might push the patch.

Too hasty. Further runs of tramp-tests.el fail for this. I'll check
what's up.

>>         Stefan

Best regards, Michael.

Message #35 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 27371 <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Mon, 24 Jul 2017 17:01:55 +0200

[Message part 1 (text/plain, inline)]

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

Hi Stefan,

>>> Then we can add support for define-type, ert-deftest, cl-defmethod, ...
>> That's my original question: what does it take to unload a `define-type'
>> entry?
>
> Presumably it should undo what cl-struct-define does.
> The main part would be (setf (cl--find-class name) nil), I guess.

I've ended up with the appended patch. Would this be OK? More precise,
would the implementation of

(cl-defmethod loadhist-unload-element ((x (head define-type)))

be the right thing?

>         Stefan

Best regards, Michael.

[Message part 2 (text/plain, attachment)]

Message #38 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 27371 <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Mon, 24 Jul 2017 11:33:59 -0400

> +    ;; Remove internal functions.
> +    (dolist (fun
> +	     (append
> +	      ;; constructor, copier, predicate, tag-symbol.
> +	      `(,(format "make-%s" name)
> +	        ,(format "copy-%s" name)
> +	        ,(format "%s-p" name)
> +	        ,(format "cl-struct-%s-tags" name))
> +	      ;; accessors.
> +	      (mapcar #'(lambda (y) (format "%s-%s" name y)) slots)))

AFAIK all these functions are defined with `defalias', so they should
already be handled by their own entry in load-history.


        Stefan

Message #41 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 27371 <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Mon, 24 Jul 2017 18:13:21 +0200

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

>> +    ;; Remove internal functions.
>> +    (dolist (fun
>> +	     (append
>> +	      ;; constructor, copier, predicate, tag-symbol.
>> +	      `(,(format "make-%s" name)
>> +	        ,(format "copy-%s" name)
>> +	        ,(format "%s-p" name)
>> +	        ,(format "cl-struct-%s-tags" name))
>> +	      ;; accessors.
>> +	      (mapcar #'(lambda (y) (format "%s-%s" name y)) slots)))
>
> AFAIK all these functions are defined with `defalias', so they should
> already be handled by their own entry in load-history.

You're right. So what's left to do is

    (setf (cl--find-class name) nil)))

If you don't object I would commit the patch then ('tho it's rather your patch).

>         Stefan

Best regards, Michael.

Message #44 received at 27371 <at> debbugs.gnu.org (full text, mbox):

From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
To: Michael Albinus <michael.albinus <at> gmx.de>
Cc: 27371 <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Mon, 24 Jul 2017 12:31:09 -0400

> If you don't object I would commit the patch then ('tho it's rather
> your patch).

Please do,


        Stefan

Message #49 received at 27371-done <at> debbugs.gnu.org (full text, mbox):

From: Michael Albinus <michael.albinus <at> gmx.de>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 27371-done <at> debbugs.gnu.org
Subject: Re: bug#27371: 26.0.50;
 Unexpected element (define-type . tramp-file-name) in load-history
Date: Mon, 24 Jul 2017 19:39:31 +0200

Stefan Monnier <monnier <at> IRO.UMontreal.CA> writes:

>> If you don't object I would commit the patch then ('tho it's rather
>> your patch).
>
> Please do,

Done. Closing the bug.

>         Stefan

Best regards, Michael.

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