Re: Unbound variable warning/exception

[Ludovic Courtès]

Hi,

Aleix Conchillo Flaqué <aconchillo@gmail.com> skribis:

> On Fri, Dec 18, 2020 at 5:26 PM Christopher Lam
> <christopher.lck@gmail.com> wrote:
>>
>> Hi guilers, I saw in guix the incredibly useful unbound-variable exception
>> printer written by Ludovic. I've adapted for use in gnucash as
>> https://github.com/Gnucash/gnucash/commit/6f951784 -- there are now in
>> guile 3.0.4 many more unbound-var warnings than in 3.0.2 -- wouldn't it be
>> a useful hint to add to the warning in core guile as well?
>
> Wow, this is great!
>
> This should definitely be added to guile by default.

In Guix, the hint is displayed by an 'unbound-variable exception
handler, not by the 'unbound-variable printer; I think doing it in the
printer could be confusing.

Perhaps what could be done is export an 'unbound-variable handler that
does all this, and have the REPL use it?

Thanks,
Ludo’.