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The Rust toolchain installer

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# Summary This issue is intended to gather community feedback on the future direction of rustup's automatic install behaviour. It suggests some changes to the way rustup does implicit installs...

### Steps 1. Don't have `+nightly-2023-12-19` installed 2. In any project, `CARGO_NET_OFFLINE=true cargo +nightly-2023-12-19 check --locked --offline` ### Expected behaviour Error message saying `+nightly-2023-12-19` is not installed, mentioning `CARGO_NET_OFFLINE` ###...

#4250 currently does not provide any custom toolchain validity check when provided with extra components, such as in the configuration below: ```toml [toolchain] channel = "ms-1.84.1" targets = [ "aarch64-pc-windows-msvc",...

### Verification - [x] I searched for recent similar issues at https://github.com/rust-lang/rustup/issues?q=is%3Aissue+is%3Aopen%2Cclosed and found no duplicates. - [x] I am on the latest version of Rustup according to https://github.com/rust-lang/rustup/tags and...

bug

`RUSTUP_WINDOWS_PATH_ADD_BIN`, as mentioned in #3703, isn't documented on the website: . I think it should be documented, however, because it's useful when writing a program that links to `rustc_driver.dll`. (See...

### Problem you are trying to solve `rustup doc` requires giving the exact path to an item in order to get its documentation. I'd love to write `rustup doc File`...

enhancement

### Problem you are trying to solve To utilize `rustup` completions, you are suggested to run `rustup completions` every time login shell is opened https://rust-lang.github.io/rustup/installation/index.html#enable-tab-completion-for-bash-fish-zsh-or-powershell. On some machines, this may...

enhancement

### Location In rustup tool when running rustup completions help: ![Image](https://github.com/user-attachments/assets/f3277a96-4183-4410-adb9-78cadb8caf9b) ### Summary When I copy and paste the path provided by rustup, it shows me a path error. I...

bug
O-windows

Microsoft Windows [Version 10.0.19045.5608] (c) Microsoft Corporation. All rights reserved. C:\WINDOWS\system32>rustup update info: no updatable toolchains installed info: checking for self-update info: cleaning up downloads & tmp directories C:\WINDOWS\system32>rustup update...

### Problem you are trying to solve I always want the `rust-analyzer` component installed when working with Rust. I work across a number of rust projects that periodically update their...

enhancement