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Thanks for the input and links. I'll need to test out the costs of the mitigations.

BTW, I found one of the rust rfc documents helpful for understanding the borrow checker. Do you know if there is a similar rust RFC document for the upcoming polonius borrowchecker, even if it's just a working copy? I'm having trouble finding anything beyond some blog posts.

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Unfortunately I'm not super-familiar with developments around Polonius, so chances are what I can point you towards are the same things you found when searching. The most relevant bits appear to be the Polonius book [0] linked from the repo [1], but I don't know how up to date the book is or if there are more up-to-date resources. The RFC book [2] doesn't seem to have anything obviously about Polonius either.

[0]: https://rust-lang.github.io/polonius/

[1]: https://github.com/rust-lang/polonius

[2]: https://rust-lang.github.io/rfcs/

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