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If you found this interesting, you may also be interested to hear about some related projects with similar goals/scopes: Miri[0], Kani[1], and Creusot[2]. There looks to be some significant overlap between Verus, Kani, and Creusot but I've not used any of them so I'll refrain from trying to differentiate them.

[0]https://github.com/rust-lang/miri

[1]https://github.com/model-checking/kani

[2]https://github.com/creusot-rs/creusot

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Miri: proves pre-defined properties, no changes to code other than adding a few annotations

Kani: use in a test suite

Creusot: annotations

Verus: annotations or macro

The macro system looks very nice if it doesn't slow down the normal build.

AI tells me that code using the verus! macro everywhere would double in build time but if only used ocassionally the verus! macro would only increase build time by a few percent. The attribute annotation would basically be free, but there is a downside that loop invariants would be rejected by stable rustc.

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