Re: source of `package cl is deprecated'

[Leo Butler <leo.butler@umanitoba.ca>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Leo Butler <leo.butler@umanitoba.ca>
>> Date: Fri, 04 Dec 2020 12:13:09 -0600
>> 
>> I updated/upgraded my debian system this morning, which pulled in emacs
>> 27.1.
>> 
>> A number of my home-rolled emacs extensions relied on cl; I have
>> migrated them to cl-lib, but there is an extension that is still causing
>> emacs to emit the above-mentioned warning on start-up (and when run with
>> --daemon, emacs halts and must be killed, which I guess is a bug).
>> 
>> Question: how do I trace/find the offending bit of code? Ideally, I
>> would like to be able to force an error and use the debugger, but I
>> can't figure out how to do that.
>
> Did you try setting debug-on-message to a regexp that matches the
> warning?

Thank you, to each who answered, especially for prompting/reminding me
to RTFM. By invoking the debugger just before loading the offending
file, I was able to step through and find the offending lines of code
(an `eval-when' form and a `require 'slime' buried at the bottom of the
file).

Leo