覚え書き。

突然cargo checkが働かなくなった。

$ cargo check
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: latest update on 2021-11-01, rust version 1.56.1 (59eed8a2a 2021-11-01)
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: latest update on 2021-11-01, rust version 1.56.1 (59eed8a2a 2021-11-01)
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: latest update on 2021-11-01, rust version 1.56.1 (59eed8a2a 2021-11-01)
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: latest update on 2021-11-01, rust version 1.56.1 (59eed8a2a 2021-11-01)
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: latest update on 2021-11-01, rust version 1.56.1 (59eed8a2a 2021-11-01)
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: latest update on 2021-11-01, rust version 1.56.1 (59eed8a2a 2021-11-01)
error: 'cargo.exe' is not installed for the toolchain 'stable-x86_64-pc-windows-msvc'
To install, run `rustup component add cargo`

$ rustup component add cargo
info: syncing channel updates for 'stable-x86_64-pc-windows-msvc'
info: latest update on 2021-11-01, rust version 1.56.1 (59eed8a2a 2021-11-01)
error: Missing manifest in toolchain 'stable-x86_64-pc-windows-msvc'

これと似た状況。

error: toolchain ‘stable-x86_64-pc-windows-msvc’ does not support components · Issue #1793 · rust-lang/rustup

が、rustup uninstall stableがエラーを吐いて二進も三進もいかなくなったので結局rustupごとアンインストールして再インストール。

$ rustup self uninstall


Thanks for hacking in Rust!

This will uninstall all Rust toolchains and data, and remove
%USERPROFILE%\.cargo/bin from your PATH environment variable.

Continue? (y/N) y

info: removing rustup home
info: removing cargo home
info: removing rustup binaries
info: rustup is uninstalled

$ rustc --version
rustc 1.56.1 (59eed8a2a 2021-11-01)

$ rustup --version
rustup 1.24.3 (ce5817a94 2021-05-31)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.56.1 (59eed8a2a 2021-11-01)`

$ cargo --version
cargo 1.56.0 (4ed5d137b 2021-10-04)

すると治った。

よく分からん……。error: 'cargo.exe' is not installed for the toolchain 'stable-x86_64-pc-windows-msvc'ってどういう状況？