2024/09/21

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2024-09-21 12:10:15 +0200 <ski> "Supertyping Suggestion for Haskell" by jmeacham (of jhc) at <http://repetae.net/recent/out/supertyping.html> is something similar, but for type classes
2024-09-21 12:08:36 +0200 <ski> (you can also refine a record/product type, by removing fields, yielding a supertype)
2024-09-21 12:08:36 +0200 <tomsmeding> Lears: there are type systems that support them /shrug/
2024-09-21 12:08:15 +0200 <tomsmeding> difference in terminology, then
2024-09-21 12:08:11 +0200 <Lears> "Union types" need to be debunked so people will stop expecting them to be a thing. They don't even make sense.
2024-09-21 12:08:11 +0200 <tomsmeding> I see
2024-09-21 12:07:51 +0200 <ski> this was described in papers before LiquidHaskell existed
2024-09-21 12:07:25 +0200 <ski> you refine a variant/sum type, by removing alternatives, yielding a subtype
2024-09-21 12:07:08 +0200 <ski> given `data List a = Nil | Cons a (List a)', i'd say `data EvenList a <: List a = Nil | Cons a (OddList a)' and `data OddList a <: List a = Cons a (EvenList a)' are refinement types
2024-09-21 12:06:32 +0200 <tomsmeding> at the very least, liquid haskell has these things and calls them "refinement types" :)
2024-09-21 12:06:15 +0200merijn(~merijn@204-220-045-062.dynamic.caiway.nl)
2024-09-21 12:06:08 +0200 <tomsmeding> isn't "refinement type" a more general term?
2024-09-21 12:05:39 +0200skiwould call those (subset) comprenesion types
2024-09-21 12:04:50 +0200 <ski> yep, that's a more constructive way to phrase it