- Rust 1.89.0 will stabilize let-chains (yay 🎉). In the same release, clippy will flag `if` statements that can be collapsed further using a let-chain. Outcome: your CI will fail when 1.89.0 is released, and you can't fix it ahead of time because the feature clippy wants you to use isn't stable yet 🙃
- If you want to mitigate the problem, slap `#![allow(clippy::collapsible_if)]` on your crate.
- An even better solution from @briansmith.bsky.social: you can set an MSRV *just for clippy* via clippy.toml. This will configure a variety of lints to behave as if you were using that version to run clippy, including the collapsible_if one. Back to fearless toolchain updates!Jun 26, 2025 06:46
