Cannot build Rust 1.71.1 with 1.71.0

Apparently Rust 1.71.0 added a check that only allows it to be built with the exact same version of Rust, or a Rust that's one minor release older.

However, this also makes it impossible to build Rust 1.71.1 with a Rust that's one micro release older (1.71.0).

Unexpected rustc version: 1.71.0, we should use 1.70.x/1.71.1 to build source with 1.71.1

Is this really what was wanted? It makes it quite hard for us (Arch Linux) to build micro upgrades.

No, this isn't intended. We should permit building with the previous release for point releases (minor and patch).

#114440 is open to fix this.

#114440 has been merged I guess this can be closed?

Nominated your PR for beta backporting in case 1.72 gets a patch release too.

1.72 is still in beta, so this'll get backported to that before the release.

#114440 was backported in #114748.

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