config.rust: update references from rustc

`rustc.config` is called `rust.rustcTarget` now, and
`{rustc -> rust}.platform`.

This is the new way (tm), and is preferred since
https://github.com/NixOS/nixpkgs/pull/271707 -
though the documentation still is outdated, and some expressions in
nixpkgs were using the old interface.

This updates both.

1 files changed, 7 insertions, 7 deletions

diff --git a/doc/languages-frameworks/rust.section.md b/doc/languages-frameworks/rust.section.md
index 8a1007b7bb8a..e12bbe02bfb5 100644
--- a/doc/languages-frameworks/rust.section.md
+++ b/doc/languages-frameworks/rust.section.md
@@ -254,7 +254,7 @@ By default, it takes the `stdenv.hostPlatform.config` and replaces components
 where they are known to differ. But there are ways to customize the argument:
 
  - To choose a different target by name, define
-   `stdenv.hostPlatform.rustc.config` as that name (a string), and that
+   `stdenv.hostPlatform.rust.rustcTarget` as that name (a string), and that
    name will be used instead.
 
    For example:
@@ -262,7 +262,7 @@ where they are known to differ. But there are ways to customize the argument:
    ```nix
    import <nixpkgs> {
      crossSystem = (import <nixpkgs/lib>).systems.examples.armhf-embedded // {
-       rustc.config = "thumbv7em-none-eabi";
+       rust.rustcTarget = "thumbv7em-none-eabi";
      };
    }
    ```
@@ -274,10 +274,10 @@ where they are known to differ. But there are ways to customize the argument:
    ```
 
  - To pass a completely custom target, define
-   `stdenv.hostPlatform.rustc.config` with its name, and
-   `stdenv.hostPlatform.rustc.platform` with the value.  The value will be
+   `stdenv.hostPlatform.rust.rustcTarget` with its name, and
+   `stdenv.hostPlatform.rust.platform` with the value.  The value will be
    serialized to JSON in a file called
-   `${stdenv.hostPlatform.rustc.config}.json`, and the path of that file
+   `${stdenv.hostPlatform.rust.rustcTarget}.json`, and the path of that file
    will be used instead.
 
    For example:
@@ -285,8 +285,8 @@ where they are known to differ. But there are ways to customize the argument:
    ```nix
    import <nixpkgs> {
      crossSystem = (import <nixpkgs/lib>).systems.examples.armhf-embedded // {
-       rustc.config = "thumb-crazy";
-       rustc.platform = { foo = ""; bar = ""; };
+       rust.rustcTarget = "thumb-crazy";
+       rust.platform = { foo = ""; bar = ""; };
      };
    }
    ```