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.
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.
Wasmtime supports the current stable version of Rust.
Cranelift supports stable Rust, and follows the Rust Update Policy for Firefox.
Some of the developer scripts depend on nightly Rust, for example to run clippy and other tools, however we avoid depending on these for the main build.