proconio::fastoutがfastout: missing expanderとなりVSCodeで警告がでるようになった

解決策

• rustup update
• VSCodeアップデート

参考にしたissue

コマンド

rustup -V    
rustup 1.26.0 (5af9b9484 2023-04-05)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.71.1 (eb26296b5 2023-08-03)`

rustup update

rustup -V     
rustup 1.27.1 (54dd3d00f 2024-04-24)
info: This is the version for the rustup toolchain manager, not the rustc compiler.
info: The currently active `rustc` version is `rustc 1.80.1 (3f5fd8dd4 2024-08-06)`