Mmmm… iso-recursive types… 😋
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I'm guessing one can add in these folds and unfolds during desugaring or elaboration, without needing to expose them in the surface syntax? 🤔
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Ohh, nifty!
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What to do though, for structural type definitions… 🤔?
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back when I was thinking about similar things this paper seemed interesting: ps.informatik.uni-tuebingen.de/research/funct [I can't remember whether I "read" it at the time without understanding much, or didn't]
cc :)
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Yeah, I'll check that one out! I was trying to stay with isorecursive types though!
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I don't really understand equirecusive types yet though either!
Yeah I mentioned because my sense at the time was that equirecursive would be a nicer fit with structural types (fewer cases of "actually the same type, just encoded differently"); dunno (+ can't remember), now, if that was a good idea or not...
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(At some point I realized I was way out of my depth, and started working on a nominally typed language instead, at the time conceived of as "warmup". Which it has since, uh, outgrown.)
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