The Enarx organization owns several Rust repos. However, the CI for PRs tends to test against whatever the stable release of Rust is at the moment the PR is submitted. Because Rust adds new warnings and clippy lints over time, and because our CI requires builds to pass without warnings, this means that PRs to Rust repos sometimes require fixing unrelated warnings before the CI will pass, which is annoying and a barrier to contribution.

Ideally, for each Rust crate in the Enarx organization we would determine the oldest Rust release that we would like to support, and then codify that version in a rust-toolchain file in the repo, and then have CI use this file to determine which Rust version to test against. This will both enforce MSRV and prevent the need to fix unrelated warnings when filing PRs.

The first step will be to add rust-toolchain files and rust-version fields to each of the following repos:

• vfs (?)
• iocuddle
• mmledger
• flagset
• lset
• crt0stack
• xsave
• vdso
• mmarinus
• nbytes
• primordial
• ciborium
• snp
• rcrt1
• sgx
• testaso
• noted

Once this is done, then we can determine how our CI will use this information.