2024/09/04

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2024-09-04 03:35:39 +0200merijn(~merijn@204-220-045-062.dynamic.caiway.nl)
2024-09-04 03:30:32 +0200weary-traveler(~user@user/user363627)
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2024-09-04 02:48:03 +0200weary-traveler(~user@user/user363627) (Remote host closed the connection)
2024-09-04 02:45:07 +0200 <Leary> (in Haskell the limits are just softer, bottoming out at runtime rather than failing to type check)
2024-09-04 02:42:32 +0200gmg(~user@user/gehmehgeh)
2024-09-04 02:42:28 +0200 <Leary> The infiniteness is in the semantics we ascribe, not in the program that actually runs. Of course that limits which operations we can support, but this is all the same whether in Haskell or System F.
2024-09-04 02:41:23 +0200 <Leary> Bowuigi: GFP_F := forall r. (forall x. (x -> F x) -> x -> r) -> r; ana_F := /\a. \coalg:a -> F a. \seed:a. /\r. \expair:forall x. (x -> F x) -> x -> r. expair a coalg seed; out_F := \ff:GFP_F. ff (F GFP_F) /\a. \coalg:a -> F a. \seed:a. map_F a GFP_F (ana_F a coalg) (coalg seed)
2024-09-04 02:40:44 +0200myxos(~myxos@syn-065-028-251-121.res.spectrum.com)
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2024-09-04 02:32:30 +0200merijn(~merijn@204-220-045-062.dynamic.caiway.nl)
2024-09-04 02:32:06 +0200 <Inst> like, say, Foo pat; Bar pat = pat * 3
2024-09-04 02:31:48 +0200 <Inst> i'm sort of disappointed you can't condense multiple pattern matches into the same term, though
2024-09-04 02:31:27 +0200 <Inst> are the or patterns from GHC 9.12 actually useful?
2024-09-04 02:29:30 +0200 <haskellbridge> <Bowuigi> If the only valid operations are pretty much "zip" (over codata) and take (to data) variants it makes sense though
2024-09-04 02:28:40 +0200 <haskellbridge> <Bowuigi> Leary what about the "infinite-ness" of codata tho? You can't fold/traverse over infinite structures without taking infinite time on normal order (thus, breaking Church-Rosser and disproving totality)
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