devShell: add clippy and rustfmt from the current toolchain (#432)

CHANGELOG.md

@@ -10,6 +10,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 * `craneUtils` will now be built with the `rustPlatform` provided by nixpkgs
   instead of the currently configured toolchain. This should hopefully result in
   fewer surprises for those testing with really old MSRV toolchains.
+* `devShell` will now additionally include `clippy` and `rustfmt` from the
+  currently configured toolchain
 
 ## [0.14.2] - 2023-10-15
 

docs/API.md

@@ -780,6 +780,9 @@ attributes are passed straight through, so any `mkShell` behavior can be used
 as expected: namely, all key-value pairs other than those `mkShell` consumes
 will be set as environment variables in the resulting shell.
 
+Note that the current toolchain's `cargo`, `clippy`, `rustc`, and `rustfmt`
+packages will automatically be added to the devShell.
+
 #### Optional attributes
 * `checks`: A set of checks to inherit inputs from, typically
   `self.checks.${system}`. Build inputs from the values in this attribute set

lib/devShell.nix

@@ -1,6 +1,8 @@
 { cargo
+, clippy
 , mkShell
 , rustc
+, rustfmt
 }:
 
 { checks ? { }
@@ -20,10 +22,10 @@ in
 mkShell (cleanedArgs // {
   inputsFrom = builtins.attrValues checks ++ inputsFrom;
 
-  packages =
-    [
-      rustc
-      cargo
-    ]
-    ++ packages;
+  packages = [
+    rustc
+    cargo
+    clippy
+    rustfmt
+  ] ++ packages;
 })