Automated way to remove let chains

1

Is there a way to automate removing let chains?

I have a codebase which I'd like to maintain support for latest stable rust as well as 1.85.

Notably Rust 1.85 doesn't support let-chains. I find that let-chains do improve the code quality quite a bit so I'd like to continue using them.

I'm thinking of ways I can maintain both branches moving forward. One thought I had: If a clippy fixup lint existed for let-chains I could just apply that to produce code that's 1.85 compatible.

2

There isn't one currently. A Clippy lint with an automatic fix would be one way to do it.

You could also try rewriting yourself with syn.

There used to be rerast AST rewriter, but the project is dead, and won't recognize let chains syntax. Maybe ast-grep can?

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