Re: (debug) backtrace: how to show source code at current location.

[Larry Evans]

On 01/05/11 13:06, Drew Adams wrote:
>> Please, how can I find out what's causing this error message:
>>
>>   "(wrong-type-argument arrayp tab)"
> 
> From your error message alone, it seems that the symbol `tab' is being passed 
> to
> some function that expects an array.  That's not much help yet, but things 
> might
> become clearer when you dig deeper using the debugger.
> 
> (setq debug-on-error t)
> 
> 1. Load source (*.el) files for the library where the error occurred.
> 
> IOW, look at the `debug-on-error' backtrace to see which function(s) were
> involved when the error occurred.  Then use `C-h f' or `find-func' to find the
> function definition(s) (source file(s)).  Load the source file(s) (*.el) using
> `load-file' or `load-library', including the extension `.el' in the name.
> 
> 2. Provoke the error and backtrace again.  It should now show more source-code
> entry points instead of byte-code (the `(byte-code "ÁÂÃ...' stuff)
> 
> 3. You can also use `M-x debug-on-entry THE-FUNCTION' to enter the debugger
> whenever a problematic function is invoked.  Then you can walk through the
> invocation to see more about what caused the error.
> 
> 
> 
Thank you very much for the help Drew.
What I did was started with just:

  (setq debug-on-error t)

as shown in the attachment (a revision of the one posted earlier).
The started emacs; however, no backtrace appeared.  OTOH, the
*Messages* buffer contained:

> Loading /home/evansl/.emacs.d/init.common.el (source)...
> Loading /home/evansl/.recentf...done
> Cleaning up the recentf list...done (0 removed)
> Loading /usr/share/emacs/site-lisp/haskell-mode/haskell-site-file.el 
> (source)...done
> Loading /home/evansl/.emacs.d/init.common.el (source)...done
> Loading desktop...done
> Loading eldoc...done
> uncompressing indent.el.gz...done
> Note: file is write protected
> Loading cc-mode...done
> Note: file is write protected
> c-tab-stop-my-list message
> c++-mode-my-hook message:tabs=
> (0 2 4)
> c++-mode-my-hook message{
> File mode specification error: (wrong-type-argument arrayp tab)
> Loading /usr/share/emacs/site-lisp/haskell-mode/haskell-mode.el 
> (source)...done

Is there something else I should do to get a backtrace?

TIA.

-regards,
Larry

init.common.el
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