fix(install): Suggest an alternative version on MSRV failure #12798
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This will also report the error without having to download the `.crate` first. If installing multiple packages, this will also report it immediately, rather than waiting for the other packages to be installed first. This also offers us more flexibility in the error we report, like suggesting more appropriate fixes.
The next step would be to also automatically install an MSRV compatible version if compatible with the version req (rust-lang#10903). This improved error message will still be useful if the MSRV compatible version is outside of the version req. I did this as the first step - Helps people now, not needing to wait on `-Zmsrv-policy` to be stabilized - Has fewer questions on how it should be done (or if it should be)
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| // Remove any pre-release identifiers for easier comparison | ||
| let current_version = &rustc.version; | ||
| let untagged_version = semver::Version::new( | ||
| current_version.major, | ||
| current_version.minor, | ||
| current_version.patch, | ||
| ); |
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This was copied from src/cargo/ops/cargo_compile/mod.rs
ehuss
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Thanks! @bors r+ |
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Update cargo 5 commits in 794d0a82547f3081044c0aca7b6083733ce51344..6fa6fdc7606cfa664f9bee2fb33ee2ed904f4e88 2023-10-03 23:19:33 +0000 to 2023-10-10 23:06:08 +0000 - test(build): generalize test assertion for non-rustup env (rust-lang/cargo#12804) - chore: Sort dependency tables (rust-lang/cargo#12803) - fix(install): Suggest an alternative version on MSRV failure (rust-lang/cargo#12798) - rustdoc: remove the word "Version" from test cases (rust-lang/cargo#12800) - Add unsupported lowercase `-z` flag suggestion for `-Z` flag (rust-lang/cargo#12788) r? ghost
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What does this PR try to resolve?
Moves users from a bad error message, suggesting
--lockedwhich won't do anything, to suggesting a version of a package to use instead.The side benefit is errors get reported sooner
.crateThis comes at the cost of an extra
rustcinvocation.How should we test and review this PR?
Per-commit this builds it up, from tests to the final design.
Additional information
This is also written in a way to align fairly well with how we'd likely implement #10903.
This improved error message will still be useful after that issue is resolved when the MSRV compatible version is outside of the version req.