[Haskell-cafe] lens and Maybe value

[David Feuer]

What is conf? If you write a small example that actually compiles, this
will be easier to think about.

On Tue, Dec 20, 2022, 11:25 AM PICCA Frederic-Emmanuel <
frederic-emmanuel.picca at synchrotron-soleil.fr> wrote:

>
>
> ----- Le 20 Déc 22, à 17:18, David Feuer david.feuer at gmail.com a écrit :
>
> > Please clarify your question. Your code doesn't compile, and I can't tell
> > what it's supposed to do.
>
>
> replace a (Maybe a) value in a data using lens only if the new (Maybe a)
> is a Just
>
> Is it clearer ?
>
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