Toolchain 'nightly-x86_64-apple-darwin' missing from nightly 1.31.0 (de9666f12 2018-10-31)

[phansch]

This happens on Clippy's Travis CI:

info: syncing channel updates for 'nightly-x86_64-apple-darwin'
info: latest update on 2018-11-01, rust version 1.31.0-nightly (de9666f12 2018-10-31)
error: toolchain 'nightly-x86_64-apple-darwin' is not installed

https://travis-ci.org/rust-lang-nursery/rust-clippy/jobs/449198446#L87-L89

Rustup can't seem to find the toolchain It seems to be missing from the latest nightly: https://mexus.github.io/rustup-components-history/x86_64-apple-darwin.html

[kennytm]

Potentially caused by #55304

[kigawas]

On mac OS mojave

$ rustup update
info: syncing channel updates for 'stable-x86_64-apple-darwin'
info: syncing channel updates for 'nightly-x86_64-apple-darwin'
info: latest update on 2018-11-01, rust version 1.31.0-nightly (de9666f12 2018-10-31)
warning: component 'rustc' is not available anymore on target 'x86_64-apple-darwin'
warning: component 'rust-std' is not available anymore on target 'x86_64-apple-darwin'
warning: component 'cargo' is not available anymore on target 'x86_64-apple-darwin'
warning: component 'rust-docs' is not available anymore on target 'x86_64-apple-darwin'
warning: component 'rls-preview' is not available anymore on target 'x86_64-apple-darwin'
warning: component 'rust-src' is not available anymore
warning: component 'rust-analysis' is not available anymore on target 'x86_64-apple-darwin'
error: some components unavailable for download: 'rustc', 'cargo'
info: checking for self-updates

       stable-x86_64-apple-darwin unchanged - rustc 1.30.0 (da5f414c2 2018-10-24)
  nightly-x86_64-apple-darwin update failed - rustc 1.30.0-nightly (73c78734b 2018-08-05)

[shriraj20]

rustup update
info: syncing channel updates for 'stable-x86_64-apple-darwin'
info: latest update on 2021-10-21, rust version 1.56.0 (09c42c4 2021-10-18)
info: downloading component 'rust-src'
2.3 MiB / 2.3 MiB (100 %) 2.3 MiB/s in 1s ETA: 0s
info: downloading component 'cargo'
4.4 MiB / 4.4 MiB (100 %) 3.3 MiB/s in 1s ETA: 0s
info: downloading component 'clippy'
info: downloading component 'rust-docs'
17.3 MiB / 17.3 MiB (100 %) 3.0 MiB/s in 5s ETA: 0s
info: downloading component 'rust-std'
22.1 MiB / 22.1 MiB (100 %) 3.2 MiB/s in 7s ETA: 0s
info: downloading component 'rustc'
62.2 MiB / 62.2 MiB (100 %) 3.0 MiB/s in 22s ETA: 0s
info: downloading component 'rustfmt'
info: removing previous version of component 'rust-src'
info: rolling back changes
error: failure removing component 'rust-src', directory does not exist: 'lib/rustlib/src/rust/library/std/src/os/unix/raw.rs'
info: checking for self-updates

stable-x86_64-apple-darwin update failed - rustc 1.55.0 (c8dfcfe 2021-09-06)

info: cleaning up downloads & tmp directories