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Error for rustup run +stable cargo check is misleading #4571
Description
Verification
- I searched for recent similar issues at https://github.com/rust-lang/rustup/issues?q=is%3Aissue and found no duplicates.
- I am on the latest version of Rustup according to https://github.com/rust-lang/rustup/tags and am still able to reproduce my issue.
Problem
As a user used to +toolchain, it can be easy to accidentally do that with cargo run but the error you get doesn't communicate that problem:
$ rustup run +stable cargo check
error: toolchain '+stable' is not installedSteps
- Run
rustup run +stable cargo -h
Possible Solution(s)
If + is reserved from being a leading character in toolchains: focus the error around the + prefix syntax being unsupported and provide a help message saying to drop it
If + is allowed as a leading character in toolchains: Check for a + prefixand add a note saying that the+` prefix syntax isn't used here and it can be dropped if thats the users intent
Notes
No response
Rustup version
rustup 1.28.2 (e4f3ad6f8 2025-04-28)Installed toolchains
Default host: x86_64-unknown-linux-gnu
rustup home: /home/epage/.rustup
installed toolchains
--------------------
stable-x86_64-unknown-linux-gnu (active, default)
beta-x86_64-unknown-linux-gnu
nightly-x86_64-unknown-linux-gnu
nightly-2023-11-13-x86_64-unknown-linux-gnu
nightly-2024-06-03-x86_64-unknown-linux-gnu
nightly-2024-09-10-x86_64-unknown-linux-gnu
nightly-2024-10-19-x86_64-unknown-linux-gnu
nightly-2025-01-27-x86_64-unknown-linux-gnu
nightly-2025-04-02-x86_64-unknown-linux-gnu
nightly-2025-06-26-x86_64-unknown-linux-gnu
1.0.0-x86_64-unknown-linux-gnu
1.48-x86_64-unknown-linux-gnu
1.48.0-x86_64-unknown-linux-gnu
1.56.0-x86_64-unknown-linux-gnu
1.57.0-x86_64-unknown-linux-gnu
1.58.0-x86_64-unknown-linux-gnu
1.60.0-x86_64-unknown-linux-gnu
1.64-x86_64-unknown-linux-gnu
1.64.0-x86_64-unknown-linux-gnu
1.65-x86_64-unknown-linux-gnu
1.65.0-x86_64-unknown-linux-gnu
1.66-x86_64-unknown-linux-gnu
1.66.0-x86_64-unknown-linux-gnu
1.70-x86_64-unknown-linux-gnu
1.70.0-x86_64-unknown-linux-gnu
1.71-x86_64-unknown-linux-gnu
1.71.0-x86_64-unknown-linux-gnu
1.71.1-x86_64-unknown-linux-gnu
1.72-x86_64-unknown-linux-gnu
1.74-x86_64-unknown-linux-gnu
1.75-x86_64-unknown-linux-gnu
1.76-x86_64-unknown-linux-gnu
1.80-x86_64-unknown-linux-gnu
1.80.1-x86_64-unknown-linux-gnu
1.81-x86_64-unknown-linux-gnu
1.83-x86_64-unknown-linux-gnu
1.83.0-x86_64-unknown-linux-gnu
1.84-x86_64-unknown-linux-gnu
1.85-x86_64-unknown-linux-gnu
1.86-x86_64-unknown-linux-gnu
1.86.0-x86_64-unknown-linux-gnu
1.88-x86_64-unknown-linux-gnu
1.89-x86_64-unknown-linux-gnu
1.90-x86_64-unknown-linux-gnu
stage1
active toolchain
----------------
name: stable-x86_64-unknown-linux-gnu
active because: it's the default toolchain
installed targets:
aarch64-apple-darwin
i686-unknown-linux-gnu
i686-unknown-linux-musl
powerpc-unknown-linux-gnu
wasm32-unknown-unknown
x86_64-pc-windows-gnu
x86_64-pc-windows-msvc
x86_64-unknown-linux-gnu
x86_64-unknown-linux-musl
x86_64-unknown-noneOS version
Linux dross 6.16.3-76061603-generic #202508231538~1758561135~22.04~171c8de SMP PREEMPT_DYNAMIC Mon S x86_64 x86_64 x86
_64 GNU/Linux
Activity
fix(toolchain): improve error message for '+toolchain' prefix
fix(toolchain): improve error message for '+toolchain' prefix
fix(toolchain): improve error message for '+toolchain' prefix
fix(toolchain): improve error message for '+toolchain' prefix
fix(toolchain): improve error message for '+toolchain' prefix
fix(toolchain): improve error message for '+toolchain' prefix
fix(toolchain): improve error message for '+toolchain' prefix