Re: Temporarily suppress all error messages

On 5/19/26 9:32 AM, Leo Butler wrote:

> Thanks, Barton. The hazards of auto-complete.
>
> Michel, Re: MTELL messages.
>
> I have come to hate MTELL. In the course of working on Yamwi, where we
> try to corral all the various messages, warnings and errors from Maxima,
> MTELL has stood out for me as being the most carelessly crafted way to
> dump text to a terminal. In my opinion, if Maxima needs to communicate a
> message to the user that is not a question, then it is at least a
> warning and should be printed by MWARNING (which prints to
> *ERROR-OUTPUT*). Indeed, when I grep src/*.lisp for calls to MTELL, it
> looks like virtually every such call is a warning or an error message. I
> don't understand why MWARNING is not used for these messages.

I didn’t check, but if those MTELL things are really warnings, we should 
make them call MWARNING.

I also wouldn’t be opposed to support turning off mwarning and/or mtell 
messages. I think merror should require more work from the user to turn 
them off.

> That's my ¢2.
>
> Leo
>
>
> On Tue, May 19 2026, Michel Talon<[email protected]> wrote:
>
>> Le 19/05/2026 à 17:52, Barton Willis a écrit :
>>
>>> Should :lisp(setf *error-output* (make-output-string-stream)) be
>>> :lisp(setf *error-output* (make-string-output-stream))?
>>>
>>>
>> You are right, this works, the other doesn't, because
>> make-output-string-stream is a function in sbcl-impl etc.
>>
>> This being said seeing all format output suppressed seems to me quite
>> strange. Moreover this also kills merror messages,
>>
>> but not mtell messages, so in my opinion should be discouraged.
>>
>> (%i1) :lisp(setf *error-output* (make-string-output-stream))
>>
>> #<STRING-OUTPUT-STREAM {1201BA2CE3}>
>> (%i1) "1/0"~;
>>
>> (%i1) ?merror("What a mess");
>>
>> (%i2) ?mtell("What a mess");
>> What a mess(%o2)                                false
&#8203;

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