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Coding guidelines

For the most part, Wasmtime and Cranelift follow common Rust conventions and pull request (PR) workflows, though we do have a few additional things to be aware of.

rustfmt

All PRs must be formatted according to rustfmt, and this is checked in the continuous integration tests. You can format code locally with:

$ cargo fmt

at the root of the repository. You can find more information about rustfmt online too, such as how to configure your editor.

Minimum Supported rustc Version

Wasmtime and Cranelift support the latest three stable releases of Rust. This means that if the latest version of Rust is 1.72.0 then Wasmtime supports Rust 1.70.0, 1.71.0, and 1.72.0. CI will test by default with 1.72.0 and there will be one job running the full test suite on Linux x86_64 on 1.70.0.

Some of the CI jobs depend on nightly Rust, for example to run rustdoc with nightly features, however these use pinned versions in CI that are updated periodically and the general repository does not depend on nightly features.

Updating Wasmtime's MSRV is done by editing the rust-version field in the workspace root's Cargo.toml