Improve error message for incomplete toolchains#4819
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Inconnu08 wants to merge 1 commit intorust-lang:mainfrom
Open
Improve error message for incomplete toolchains#4819Inconnu08 wants to merge 1 commit intorust-lang:mainfrom
Inconnu08 wants to merge 1 commit intorust-lang:mainfrom
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rami3l
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Apr 19, 2026
| .with_stderr(str![[r#" | ||
| error: toolchain 'nightly-[HOST_TRIPLE]' appears to be incomplete | ||
| help: this may happen if the toolchain installation was interrupted | ||
| help: run `rustup toolchain install nightly-[HOST_TRIPLE]` to reinstall |
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Suggest adding an extra step to see if the suggestion really works.
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I just tried adding an extra step to verify the suggested reinstall command, but it exposed that rustup toolchain install nightly currently reports the toolchain as unchanged and does not repair the missing-manifest state.
Since that seems like a separate behavioral issue, I’ve kept this PR focused on improving the diagnostic message.
I’ll open a follow-up issue to track this recovery behavior.
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Improve the error message shown when
rustupencounters a toolchain that is missing its manifest.Interrupted installations can leave a partially installed toolchain behind. Rustup already improves the recovery experience when reinstalling such toolchains (#4725), but users can still encounter a confusing "Missing manifest" error when interacting with the incomplete toolchain before retrying installation.
Related to #4724
Builds on the interrupted-install UX improvements from #4725