{
  "$type": "site.standard.document",
  "bskyPostRef": {
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    "uri": "at://did:plc:ivbknywyskln22er3nkssdhl/app.bsky.feed.post/3mmfxxjavmrd2"
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  "path": "/t/hope-to-improve-the-error-messages-of-cargo-or-rustup/24350#post_2",
  "publishedAt": "2026-05-21T22:00:54.000Z",
  "site": "https://internals.rust-lang.org",
  "tags": [
    "github.com/rust-lang/rustup",
    "Improve error message for incomplete toolchains (#4819)",
    "Inconnu08",
    "+37\n-1",
    "…"
  ],
  "textContent": "I think this error message comes from rustup. It looks like it has already seen some improvement here\n\ngithub.com/rust-lang/rustup\n\n####  Improve error message for incomplete toolchains (#4819)\n\n`main` ← `Inconnu08:improve-missing-manifest-error`\n\nopened 01:58AM - 19 Apr 26 UTC\n\n\n\n            Inconnu08\n          \n\n\n+37\n-1\n\n\nImprove the error message shown when `rustup` encounters a toolchain that is mis…sing 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. - Added a test that removes the manifest file from an installed toolchain and verifies the improved error message Related to #4724 Builds on the interrupted-install UX improvements from #4725\n\n\n    -   #[error(\"Missing manifest in toolchain '{}'\", .0)]\n    +   #[error(\n    +       \"missing manifest in toolchain '{0}'\\n\\\n    +    help: this may happen if the toolchain installation was interrupted\\n\\\n    +    help: try reinstalling or updating the toolchain\"\n    +   )]\n\n\nbut `rustup` currently has a really slow release cycle (as far as I know there are people wanting to improve that), so it isn't in your installed version yet.\n\nNonetheless, I wonder if further improvement is needed. I assume in your case it wasn't clear to you that this is a _rustup_ error, since I came up from a call to `rustc` (which does - with a rustup install of `rustc` - go through a rustup binary internally to select the version). If you'd agree that that's useful / needed (i.e. that \"try updating the toolchain\" wouldn't have helped you to know to invoke `rustup update` in your context) then feel free to open an issue on the `rustup` repo for this ^^",
  "title": "Hope to improve the error messages of cargo or rustup"
}