Help debug an error in pre-command-hook?

Help debug an error in pre-command-hook?

[Leo]

I am seeing an error:

Error in pre-command-hook: 

(wrong-type-argument symbolp (lambda (&rest --cl-rest--) (interactive)
(apply (lambda (G91516 G91517 G91518) (setq
minor-mode-overriding-map-alist (symbol-value G91518)) (bury-buffer) (if
(and (symbol-value G91517) (not (one-window-p))) (delete-window)) (if
(window-live-p (symbol-value G91516)) (select-window (symbol-value
G91516)))) (quote --origwin--) (quote --delete-p--) (quote --old--)
--cl-rest--)))

Before the error, the value of pre-command-hook is:

   pre-command-hook is a variable defined in `C source code'.
   Its value is (t comint-preinput-scroll-to-bottom)
   
   Local in buffer *Python*; global value is 
   (delete-selection-pre-hook tooltip-hide)


But looking at the source of comint-preinput-scroll-to-bottom, I cannot
see where it can generate this error? Any idea how to debug this?

Thanks in advance.

Leo

Re: Help debug an error in pre-command-hook?

[martin rudalics]

 > Error in pre-command-hook:
 >
 > (wrong-type-argument symbolp (lambda (&rest --cl-rest--) (interactive)
 > (apply (lambda (G91516 G91517 G91518) (setq
 > minor-mode-overriding-map-alist (symbol-value G91518)) (bury-buffer) (if
 > (and (symbol-value G91517) (not (one-window-p))) (delete-window)) (if
 > (window-live-p (symbol-value G91516)) (select-window (symbol-value
 > G91516)))) (quote --origwin--) (quote --delete-p--) (quote --old--)
 > --cl-rest--)))
 >
 > Before the error, the value of pre-command-hook is:
 >
 >    pre-command-hook is a variable defined in `C source code'.
 >    Its value is (t comint-preinput-scroll-to-bottom)
 >
 >    Local in buffer *Python*; global value is
 >    (delete-selection-pre-hook tooltip-hide)
 >
 >
 > But looking at the source of comint-preinput-scroll-to-bottom, I cannot
 > see where it can generate this error? Any idea how to debug this?

I can neither find

(setq minor-mode-overriding-map-alist

nor

origwin

anywhere in the Emacs sources so maybe this is something from your
customizations or a package you load.  Try printing the values of
`pre-command-hook' from within `comint-preinput-scroll-to-bottom'.

martin

Re: Help debug an error in pre-command-hook?

[Stefan Monnier]

> I am seeing an error:
> Error in pre-command-hook: 

Are you using Emacs-24?  [In Emacs-24 I try to provide the faulty hook
function in the error message, which can be really helpful]

> (wrong-type-argument symbolp (lambda (&rest --cl-rest--) (interactive)
> (apply (lambda (G91516 G91517 G91518) (setq
> minor-mode-overriding-map-alist (symbol-value G91518)) (bury-buffer) (if
> (and (symbol-value G91517) (not (one-window-p))) (delete-window)) (if
> (window-live-p (symbol-value G91516)) (select-window (symbol-value
> G91516)))) (quote --origwin--) (quote --delete-p--) (quote --old--)
> --cl-rest--)))

This looks like the macroexpansion of a lexical-let closure.
I guess the code expects a function name and not a lambda expression
(e.g. `fboundp').

> Before the error, the value of pre-command-hook is:

>    pre-command-hook is a variable defined in `C source code'.
>    Its value is (t comint-preinput-scroll-to-bottom)
   
>    Local in buffer *Python*; global value is 
>    (delete-selection-pre-hook tooltip-hide)

> But looking at the source of comint-preinput-scroll-to-bottom, I cannot
> see where it can generate this error? Any idea how to debug this?

I tried to look for a package which uses both lexical-let and one of the
symbols that appear above but can't find it.  Can you reproduce it with
emacs -Q?


        Stefan

Re: Help debug an error in pre-command-hook?

[Leo]

On 2012-02-10 06:20 +0800, Stefan Monnier wrote:
> Are you using Emacs-24?  [In Emacs-24 I try to provide the faulty hook
> function in the error message, which can be really helpful]

I tracked this down. It is a 3rd party library (autopair.el) that tries
to get symbol-name of this-command which can be non-symbol.

Leo