tonyg changed the topic of #racket to: The Racket Programming Language -- https://racket-lang.org/ -- https://gather.town/app/wH1EDG3McffLjrs0/racket-users -- http://pasterack.org -- logged at https://libera.irclog.whitequark.org/racket/ -- This is the right place to ask for help with (Dr)Racket. Remember to wait around for an answer!
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<Putonlalla> How can I express class constraints, as in this simple example? https://pastebin.com/mrpJrZHS
<Putonlalla> It gives me `monads.rkt:34:45: <>: no instance for semigroup` when evaluating the first bind.
<Putonlalla> If I add in the commented lines, it will work, but binds every `applicative` instance to the `list-monoid` instead of whatever is passed in using `with-instances`.
<Putonlalla> Also, before you ask, neither `(with-instance list-monoid (with-instance writer-monad ...))` nor `(with-instance (with-instance list-monoid writer-monad) ...)` work either.
<bremner> Putonlalla: that seems quite specific to the algebraic racket collection? I don't know how many users there are for that. Maybe you would have better luck on the discourse instance.
<Putonlalla> I guess I could ask the author directly.
<bremner> or that. Maybe a github issue?
<Putonlalla> It could also be an issue of me not understanding scopes and binding properly.
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<Tuplanolla> I opened an issue about it. https://github.com/dedbox/racket-algebraic/issues/93
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