Toot

Written by Ed Page on 2025-01-09 at 16:25

I am really excited that the MSRV-aware resolver for Cargo is now out, see https://blog.rust-lang.org/2025/01/09/Rust-1.84.0.html

I am hopeful that this will

• Reduce contentious arguments over what toolchain version to support

• Give maintainers the space to choose higher MSRVs, as they desire

I recognize the exact solution isn't perfect. It comes from several compromises involving both implementation details and end-user requirements.

I also recognize not everyone will agree with every choice made. For anyone coming into this conversation without context, the RFC devoted a lot of space (making it one of the largest RFCs) to the motivations for the decisions it made, including

• Breaking down different workflows and analyzing how they work today, see https://rust-lang.github.io/rfcs/3537-msrv-resolver.html#workflows

• Evaluating the proposed solution and alternatives against those workflows, see https://rust-lang.github.io/rfcs/3537-msrv-resolver.html#resolver-behavior

A lot of the RFC discussion (https://github.com/rust-lang/rfcs/pull/3537) also revolved around that.

In the end, each perspective is optimizing for different care abouts, making educated guesses on how the non-participants operate, and predicting how people's behavior will change with this RFC. There is no "right answer" and we moved forward with "an answer". See also https://github.com/rust-lang/rfcs/pull/3537#issuecomment-1968172897.

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