Add Flux tool description and CI workflow #403
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Update the version of Flux and simplify contracts for int conversion as discussed in #403 (comment). Note that this also includes an update in Flux to the toolchain version matching the one in verify-rust-std, which should fix [this CI failure](https://github.com/model-checking/verify-rust-std/actions/runs/16326340547/job/46117341963). Our PR became out of sync between toolchain updates. We apologize for that! --------- Co-authored-by: Ranjit Jhala <[email protected]>
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This PR introduces Flux to the list of tools used in the book and adds a corresponding CI workflow.
The CI workflow runs Flux on a subset of
core(specifically, files undersrc/ascii) to verify the absence of array out-of-bounds errors. It demonstrates how to annotate the code with refinement types to specify the pre- and post-conditions necessary to prove safety on the subset that Flux is enabled.The Flux tool and necessary dependencies are built from source on CI (pinning specific commits).
Resolves #362