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Re: Wrong type argument: arrayp, nil


From: Gracjan Polak
Subject: Re: Wrong type argument: arrayp, nil
Date: Sun, 20 Apr 2014 20:25:20 +0200

Thanks, that got me started.

Is there a debug tutorial somewhere or d and c and q is all that is needed
in real life?

How does you debug-edit-debug cycle look like? Is C-x C-e all I should be
using or is there something that has a concept of 'a breakpoint'?



2014-04-20 20:16 GMT+02:00 Drew Adams <address@hidden>:

> First, do this, to get a human-readable backtrace:
>
> 1. Set variable `debug-on-error' to t.
> 2. Provoke the error, so you can see which function is problematic.
>    Quit the debugger using `q'.
> 3. Load the source files for the package in question.  This is to
>    give you a more human-readable backtrace.
> 4. Provoke the error again.
>
> You can now report the problem to the package maintainer.  If the
> responsible code is delivered as part of Emacs (not some 3rd party)
> then report the problem to Emacs Dev using `M-x report-emacs-bug'.
>
> If you want to debug it further yourself, step through the debugger
> after step #4 above.  Use `d' to single-step and `c' to skip through
> a step.  Use `q' to quit or step through until the problematic
> function returns.
>
> Some people prefer `edebug' to `debug'.  I prefer `debug', which is
> what you get with the above recipe.
>


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