Are there any projects that are trying to make application-level languages with borrow checkers?
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Idris 2 and GHC Haskell
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These track linearity, but isn't there a bunch more if you want borrow checking? Like the fractional permission style stuff the borrow checker does goes far beyond linearity IIUC.
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I can't think of anything, but it is Monday morning. Do you have any specifics?
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Can you model the mutable / immutable borrow stuff with just linear types? Not sure
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Like, I'm thinking of stuff like how you can lend out a local immutable reference to an owned binding in a scope, which prevents you altering the owned binding. Or stuff like partial borrows, etc.
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Linear types can model the ownership stuff I think - although it's a bit awkward - ie. I think you need to use CPS to make it work. It's a bit more natural with uniqueness types though (like in Clean).
Yeah Haskell uses CPS for their mutability with linear types
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Dunno if you've seen “Oxide: The Essence of Rust” by et. al.? arxiv.org/pdf/1903.00982 - I think it has a good, precise description of things Rust's borrow checker supports, but I admittedly have not got around to sitting down to read it deeply yet. 😅
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