HaoYang670 opened a new issue, #2075:
URL: https://github.com/apache/arrow-rs/issues/2075
**Describe the bug**
There are tool chain setup failures in several PRs: #2073, #2064, #2041
```
Run rustup toolchain install stable
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: checking for self-updates
stable-x8[6](https://github.com/apache/arrow-rs/runs/7354128765?check_suite_focus=true#step:3:7)_64-pc-windows-msvc
unchanged - rustc 1.62.0
(a8314ef[7](https://github.com/apache/arrow-rs/runs/7354128765?check_suite_focus=true#step:3:8)d
2022-06-27)
info: downloading self-update
warning: tool `rustfmt` is already installed, remove it from
`C:\Users\runneradmin\.cargo\bin`, then run `rustup update` to have rustup
manage this tool.
warning: tool `cargo-fmt` is already installed, remove it from
`C:\Users\runneradmin\.cargo\bin`, then run `rustup update` to have rustup
manage this tool.
error: error: Invalid value for '<+toolchain>': Toolchain overrides must
begin with '+'
Error: Process completed with exit code 1.
```
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