Re: [Sbcl-help] weird error messagtes when ignoring variables in multiple-value-bind

[Stas B. <sta...@gm...>]

If you were using slime it would've highlighted the right form.

On Tue, Sep 19, 2023 at 4:00 AM Jacek Podkanski via Sbcl-help <
sbc...@li...> wrote:

> I found the correct way to ignore the variables. What tripped me was
> trying to ignore the same variables twice, in the multiple value bind and
> at the top of the function. Sorry for the confusion.
>
> (defun draw-objects (w h)               ; view
>   ;; trying to ignore xb and yb here as well was the source of confusion
>   (format t ">>>>>>>> in draw-objects ~S " cairo:*context*)
>   (let ((cnt (format nil "~S" *selection*))
>         (tw 0)
>         (th 0)
>         (tpx 0)
>         (tpy 0))
>     (cairo:set-source-rgb 0 0 0)
>     (cairo:select-font-face "Ubuntu Mono" :normal :bold)
>     (cairo:set-font-size 20)
>
>     (multiple-value-bind  (xb yb width height)
>         (cairo:text-extents *selection*)
>       (declare (ignore xb yb))
>
> On Tue, 19 Sept 2023 at 00:10, Jacek Podkanski <rub...@go...>
> wrote:
>
>>     (multiple-value-bind  (xb yb width height)
>>         (cairo:text-extents *selection*)
>>       ;; (declare (ignore xb yb))
>>       (setf
>>        tw width
>>        th height))
>>
>> I am trying to find the size of text drawn to cairo canvas.
>>
>> I need help understanding the error messages when I try to ignore xb and
>> by.
>>
>> Trying the versions with declare form live and commented out does not
>> give me any idea of how to ignore xb and yb and suppress the warning
>> correctly.
>>
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