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Merge pull request #95165 from turion/patch-4

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Doc -> Languages & Frameworks -> Rust: Update
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@ -16,9 +16,9 @@ cargo
into the `environment.systemPackages` or bring them into
scope with `nix-shell -p rustc cargo`.
For daily builds (beta and nightly) use either rustup from
nixpkgs or use the [Rust nightlies
overlay](#using-the-rust-nightlies-overlay).
For other versions such as daily builds (beta and nightly),
use either `rustup` from nixpkgs (which will manage the rust installation in your home directory),
or use Mozilla's [Rust nightlies overlay](#using-the-rust-nightlies-overlay).
## Compiling Rust applications with Cargo
@ -478,8 +478,15 @@ Mozilla provides an overlay for nixpkgs to bring a nightly version of Rust into
This overlay can _also_ be used to install recent unstable or stable versions
of Rust, if desired.
To use this overlay, clone
[nixpkgs-mozilla](https://github.com/mozilla/nixpkgs-mozilla),
### Rust overlay installation
You can use this overlay by either changing your local nixpkgs configuration,
or by adding the overlay declaratively in a nix expression, e.g. in `configuration.nix`.
For more information see [#sec-overlays-install](the manual on installing overlays).
#### Imperative rust overlay installation
Clone [nixpkgs-mozilla](https://github.com/mozilla/nixpkgs-mozilla),
and create a symbolic link to the file
[rust-overlay.nix](https://github.com/mozilla/nixpkgs-mozilla/blob/master/rust-overlay.nix)
in the `~/.config/nixpkgs/overlays` directory.
@ -488,7 +495,34 @@ in the `~/.config/nixpkgs/overlays` directory.
$ mkdir -p ~/.config/nixpkgs/overlays
$ ln -s $(pwd)/nixpkgs-mozilla/rust-overlay.nix ~/.config/nixpkgs/overlays/rust-overlay.nix
The latest version can be installed with the following command:
### Declarative rust overlay installation
Add the following to your `configuration.nix`, `home-configuration.nix`, `shell.nix`, or similar:
```
nixpkgs = {
overlays = [
(import (builtins.fetchTarball https://github.com/mozilla/nixpkgs-mozilla/archive/master.tar.gz))
# Further overlays go here
];
};
```
Note that this will fetch the latest overlay version when rebuilding your system.
### Rust overlay usage
The overlay contains attribute sets corresponding to different versions of the rust toolchain, such as:
* `latest.rustChannels.stable`
* `latest.rustChannels.nightly`
* a function `rustChannelOf`, called as `(rustChannelOf { date = "2018-04-11"; channel = "nightly"; })`, or...
* `(nixpkgs.rustChannelOf { rustToolchain = ./rust-toolchain; })` if you have a local `rust-toolchain` file (see https://github.com/mozilla/nixpkgs-mozilla#using-in-nix-expressions for an example)
Each of these contain packages such as `rust`, which contains your usual rust development tools with the respective toolchain chosen.
For example, you might want to add `latest.rustChannels.stable.rust` to the list of packages in your configuration.
Imperatively, the latest stable version can be installed with the following command:
$ nix-env -Ai nixos.latest.rustChannels.stable.rust