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Logs: freenode/#haskell

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2020-11-26 15:53:42 <maerwald> only going down, how depressing
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2020-11-26 15:55:06 <dminuoso> Would it help if Down was renamed to Depress?
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2020-11-26 15:55:29 <hc> lol
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2020-11-26 16:20:38 <zfnmxt> I'm having some trouble with type families and ambiguous variables during type inference: https://www.pastery.net/gfxvnp/
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2020-11-26 16:21:40 <zfnmxt> I don't know how to constraint things further so that b0 can be resolved.
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2020-11-26 16:22:00 hackage phonetic-languages-simplified-properties-lists 0.1.3.0 - A generalization of the uniqueness-periods-vector-properties package. https://hackage.haskell.org/package/phonetic-languages-simplified-properties-lists-0.1.3.0 (OleksandrZhabenko)
2020-11-26 16:22:02 <zfnmxt> s/constraint/constrain
2020-11-26 16:25:09 <boxscape> zfnmxt have you tried supplying b to left with -XTypeApplications?
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2020-11-26 16:39:32 <zfnmxt> boxscape: Did you mean something like this? https://www.pastery.net/gfxvnp+sjqkje/#sjqkje
2020-11-26 16:40:00 hackage reflex-dom-retractable 0.1.7.0 - Routing and retractable back button for reflex-dom https://hackage.haskell.org/package/reflex-dom-retractable-0.1.7.0 (NCrashed)
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2020-11-26 16:43:00 hackage reflex-localize 1.0.1.0 - Localization library for reflex https://hackage.haskell.org/package/reflex-localize-1.0.1.0 (NCrashed)
2020-11-26 16:43:32 <boxscape> zfnmxt is Func a type family?
2020-11-26 16:43:59 <boxscape> or a type?
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2020-11-26 16:45:35 <zfnmxt> boxscape: It's a GADT: https://github.com/aleatory-science/frechet-dsl/blob/c7185e3aa1894e2cf3f45be4ee7506b5ad695a7d/src/Frechet/Ast.hs#L15
2020-11-26 16:46:07 <boxscape> zfnmxt is that a private repository? I'm getting a 404
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2020-11-26 16:47:02 <zfnmxt> Ah, crap. Forgot about that. Here's the relevant line: https://www.pastery.net/gfxvnp+sjqkje+xwaqdc/#xwaqdc
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2020-11-26 16:49:01 hackage reflex-localize 1.0.2.0 - Localization library for reflex https://hackage.haskell.org/package/reflex-localize-1.0.2.0 (NCrashed)
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2020-11-26 16:52:36 <boxscape> zfnmxt so I think the problem right now is that it doesn't know that n is 0, because of how you're matching on the fromSing call. Let me see if I can remember how to do that better...
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2020-11-26 16:53:22 <zfnmxt> boxscape: I suspected that might be a problem (and I remain confused about `Nat` in general--why aren't there `SZero` and `SS` constructors to match on?)
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2020-11-26 16:53:42 <boxscape> zfnmxt yeah I tend to avoid the built-in Nats for that reason
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2020-11-26 16:54:06 <zfnmxt> Is there a reason the built-ins don't export (or...lack?) the constructors?
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2020-11-26 16:54:54 <boxscape> zfnmxt I believe they're built to be efficient, e.g., if you have 1000 :: Nat, you don't want to carry around 1000 constructors if you don't need them
2020-11-26 16:55:18 <boxscape> zfnmxt it might be worth switching to a library that provides Z/S nats though for this, or rolling your own
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2020-11-26 16:55:56 <boxscape> with that I believe you could just do `case n of SZ -> left`
2020-11-26 16:56:12 <zfnmxt> boxscape: I'll try!
2020-11-26 16:57:04 <boxscape> (zfnmxt: this for example, which has singletons integration https://hackage.haskell.org/package/singleton-nats-0.4.5/docs/Data-Nat.html)
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2020-11-26 17:02:24 <zfnmxt> boxscape: That fixed it :)
2020-11-26 17:02:29 <boxscape> nice
2020-11-26 17:02:45 <zfnmxt> Thanks a lot for the help!
2020-11-26 17:02:51 <boxscape> np
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2020-11-26 17:19:00 <zfnmxt> boxscape: Unfortunately, I spoke too soon. It only works for the `n = SS SZ` case (I changed it so that `nth` is 1-indexed) if you type `nth` as `nth :: forall n x xs. Sing n -> HList (x ': xs) -> Lookup (x ': xs) n` (and it doesn't work for any case with a larger n). So it seems like the explicit `x ': xs` type pattern is what enabled the inference.
2020-11-26 17:19:12 <zfnmxt> https://www.pastery.net/gfxvnp+sjqkje+xwaqdc+rzupwz/#rzupwz
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