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最近把原来的老版本rust升级为最新版本， 转悠了半天给我报一个 目录不存在异常而升级失败。
异常信息：
info: rolling back changes
error: failure removing component 'rust-docs-x86_64-apple-darwin', directory does not exist: 'share/doc/rust/html'
stable-x86_64-apple-darwin update failed - rustc 1.70.0 (90c541806 2023-05-31)
解决方法：
mac系统下rust的安装路径在 ~/.rustup/toolchains/stable-x86_64-apple-darwin , 进入这个目录然后手动创建提示不存在的这个目录 share/doc/rust/html ， 然后在重新执行 rustup update 即可
网上其他的解决方法： 重新安装rustc， 命令如下：
# 重新安装rustc
rustup component remove rustcrustup component add rustc# 重新执行rust更新
rustup updateRust升级和验证
➜ rustup update
info: syncing channel updates for 'stable-x86_64-apple-darwin'
714.8 KiB / 714.8 KiB (100 %) 19.2 KiB/s in 50s ETA: 0s
info: latest update on 2024-03-28, rust version 1.77.1 (7cf61ebde 2024-03-27)
info: downloading component 'rustc'54.8 MiB / 54.8 MiB (100 %) 38.4 KiB/s in 31m 29s ETA: 0s
info: downloading component 'rust-src'2.5 MiB / 2.5 MiB (100 %) 51.2 KiB/s in 1m 25s ETA: 0s
info: downloading component 'cargo'7.0 MiB / 7.0 MiB (100 %) 22.4 KiB/s in 9m 47s ETA: 0s
info: downloading component 'clippy'2.2 MiB / 2.2 MiB (100 %) 57.6 KiB/s in 1m 38s ETA: 0s
info: downloading component 'rust-docs'14.9 MiB / 14.9 MiB (100 %) 20.2 KiB/s in 16m 40s ETA: 0s
info: downloading component 'rust-std'23.6 MiB / 23.6 MiB (100 %) 25.6 KiB/s in 35m 32s ETA: 0s
info: downloading component 'rustfmt'1.8 MiB / 1.8 MiB (100 %) 16.0 KiB/s in 3m 13s ETA: 0s
info: removing previous version of component 'rustc'
info: removing previous version of component 'rust-src'
info: removing previous version of component 'cargo'
info: removing previous version of component 'clippy'
info: removing previous version of component 'rust-docs'
info: removing previous version of component 'rust-std'
info: removing previous version of component 'rustfmt'
info: installing component 'rustc'54.8 MiB / 54.8 MiB (100 %) 10.2 MiB/s in 6s ETA: 0s
info: installing component 'rust-src'
info: installing component 'cargo'
info: installing component 'clippy'
info: installing component 'rust-docs'14.9 MiB / 14.9 MiB (100 %) 3.0 MiB/s in 4s ETA: 0s
info: installing component 'rust-std'23.6 MiB / 23.6 MiB (100 %) 10.0 MiB/s in 2s ETA: 0s
info: installing component 'rustfmt'stable-x86_64-apple-darwin updated - rustc 1.77.1 (7cf61ebde 2024-03-27) (from rustc 1.70.0 (90c541806 2023-05-31))info: cleaning up downloads & tmp directories
info: self-update is disabled for this build of rustup
info: any updates to rustup will need to be fetched with your system package manager
➜ rustup show
Default host: x86_64-apple-darwin
rustup home: ~/.rustupstable-x86_64-apple-darwin (default)
rustc 1.77.1 (7cf61ebde 2024-03-27)