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2020-11-04 05:11:42 <bqv> darn.
2020-11-04 05:11:47 <bqv> guess i'll do it the boring way
2020-11-04 05:13:09 <ski> hm. i was thinking maybe you could do `instance MyClass MyA _ where ...', using `PartialTypeSignatures', but it seems that's not allowed
2020-11-04 05:13:52 <bqv> heh
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2020-11-04 05:18:10 <ski> (hm, also it seems it doesn't work, if `b' is a `data' kind with just one (parameterless) constructor)
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2020-11-04 05:19:14 <bqv> data as opposed to * ?
2020-11-04 05:19:17 <bqv> first i've seen
2020-11-04 05:19:22 <ski> yes
2020-11-04 05:19:31 <bqv> what do they signify?
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2020-11-04 05:20:48 <ski> can be used to "tag" (GADT) `data' constructors, e.g. to indicate some kind of "state" or current "mode" in which something is used
2020-11-04 05:21:13 <ski> you should probably first look into `GADTs'
2020-11-04 05:21:26 <bqv> hm, i see
2020-11-04 05:21:47 <bqv> i've seen GADTs before, just not solid on the theoretical background
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2020-11-04 05:22:52 <ski> a very simple example could be an indexed state monad, which keeps track of (in the types) whether something is "open" or "closed". certain state-operations can only be done in certain states
2020-11-04 05:24:32 <ski> (there are nicer examples, but i can't recall any, off the top of my head, atm)
2020-11-04 05:24:57 <bqv> np :)
2020-11-04 05:26:59 <ski> hm, i guess another example is to have a finite map, where the values associated with different keys, in the same map, can have different types. each key will know the type of the corresponding value
2020-11-04 05:28:06 <ski> (or more generally, each key determines a "tag", and you have a value type that given a tag determines what type the corresponding value will have. so the tag doesn't have to be the value type itself, but it could determine it)
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2020-11-04 05:28:37 <bqv> hm
2020-11-04 05:29:22 <ski> @hackage dependent-map
2020-11-04 05:29:22 <lambdabot> https://hackage.haskell.org/package/dependent-map
2020-11-04 05:30:30 <ski> the key type will generally be a GADT, and the value type could also be one. `Identity' is another common choice for it
2020-11-04 05:33:08 <bqv> heh, obsidian systems. i know of them from another context
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2020-11-04 05:33:13 <ski> so if you have `data Key :: * -> * where Name :: Key String; Address :: Key String; Age :: Key Int' then `DMap Key Identity' can have at most three associations. one mapping `Name' to a `String' value, one mapping `Address' to a `String' value, and one mapping `Age' to an `Int' value
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2020-11-04 05:34:04 <ski> (in this case the "tag" is just an ordinary (concrete) type, of kind `*'. so this is not an example of `DataKinds')
2020-11-04 05:35:32 <bqv> i follow, vaguely enough
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2020-11-04 05:37:51 <ski> `DMap' is a way to have a "heterogenous" finite map. `DMap k v' is roughly `[exists i. (k i,v i)]' (except more efficient, presumably using a search tree instead of a list), where the index `i' is the "tag", each different association pair can have a different `i'
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2020-11-04 05:40:45 <ski> by pattern-matching on the value of `GADT' `k i', we can recover `i', discovering which specific index/tag was used in an association. this happens when we compare the given key with the keys in the map, discovering the `i's are the same, in case the two keys are equal
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2020-11-04 06:05:31 hackage generic-functor 0.2.0.0 - Deriving generalized functors with GHC.Generics https://hackage.haskell.org/package/generic-functor-0.2.0.0 (lyxia)
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2020-11-04 06:55:54 <bqv> TIL: it's possible to write a file between the time GHC attempts to compile it and displays the error, so the displayed code doesn't match the error it shows
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2020-11-04 07:17:20 <suzu_> big unlucky
2020-11-04 07:17:35 <bqv> oh no it was fine, i noticed it instantly
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