Re: void variable

[Lars Hansen]

>    Actually, on second thought I am not that sure anymore.  Several
>    variables, that are important enough for people to want to bind them,
>    are not autoloaded.  The situation is potentially dangerous, as we
>    saw with wdired.  So we should warn about it _somewhere_.  Either the
>    manual or the docstrings or both.
>
> The manual should direct people to autoload variables used by
> autoloaded functions, if programs might want to bind them.
>  
I agree that the manual should direct people to autoload variables used 
by autoloaded functions if programs might want to bind them.
But I also think it should be carefully explained what can happen if a 
non-autoloaded variable is bound. We cannot be sure all relevant 
variables are autoloaded.

What about:
1. Docstrings of defvar, defcustom and let briefly explain what happens 
if a local binding exist when defvar or defcustom is evaluated _and_ 
mention the autoloading pitfall.
2. Manual explain the same a bit more elaborate and direct people to 
autoload relevant variables to avoid the pitfall.