Silence unknown slot warnings
reddit / emacs

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jigarthanda-paal · 2022-01-25 15:43

Hi - I have emacs 28.0.9 with native comp. I wrote a package which
defines some classes

```
(defclass myclass () ((package-name :initarg package-name)))
```

With `oref` and `oset`, I get a lot of warnings about unknown slots.
How do I silence these?

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ieure · 2022-01-25 16:43

What's the specific warning you're getting?

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_pkal · 2022-01-25 17:00

Do you get the same issues when using `with-slots` and `(slot-value
..)`/`(setf (slot-value ..) ..)`?

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jigarthanda-paal · 2022-01-25 17:01

```
Warning (comp): custom-package.el:60:39: Warning: Unknown slot
‘:package-name’ Disable showing Disable logging
```

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jigarthanda-paal · 2022-01-25 18:50

Can you share an example? I understand the setf method but not the
slot-value one

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_pkal · 2022-01-25 19:39

`slot-value` is just the "getter", and `(setf (slot-value ..) ..)` the
"setter". `slot-value` is basically the same as `oref`, you just need
to quote the slot symbol.

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ieure · 2022-01-25 20:18

The slot name is `package-name`, but you're passing `:package-name` to
`oref`.

Here's some working example code for you:

    (defclass my/class ()
      ((package-name :initarg :package-name)))

    (oref (my/class :package-name "foo") package-name) ; "foo"

    (let ((c (my/class)))
      (oset c package-name "foo")
      (oref c package-name))