[Haskell-cafe] Help with TH trick

[David Feuer]

That doesn't work out so well when the class has a bunch of methods. I
definitely saw the nice way on Hackage ... somewhere.

On Sat, Oct 22, 2022, 2:49 PM Brandon Allbery <allbery.b at gmail.com> wrote:

> I'm not aware of anything specifically like that, but the `make…`
> functions in
> https://hackage.haskell.org/package/deriving-compat-0.6.1/docs/Data-Deriving.html
> may allow you to do something similar?
>
> On Sat, Oct 22, 2022 at 2:32 PM David Feuer <david.feuer at gmail.com> wrote:
> >
> > I remember seeing a package that offered a function used something like
> this:
> >
> > $(deriveThingy [d| instance Foo a => Thingy a |])
> >
> > to allow the user to specify the constraint(s) for a generated instance.
> I'd love to borrow the code for that, but I can't remember what package it
> was in, what class it derived, etc. Can anyone help?
> > _______________________________________________
> > Haskell-Cafe mailing list
> > To (un)subscribe, modify options or view archives go to:
> > http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe
> > Only members subscribed via the mailman list are allowed to post.
>
>
>
> --
> brandon s allbery kf8nh
> allbery.b at gmail.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.haskell.org/pipermail/haskell-cafe/attachments/20221022/0c2374e4/attachment.html>