refactor!: improve rust flake further

templates/rust/Cargo.toml

@@ -1,10 +0,0 @@
-# This line needs to come before anything else in Cargo.toml
-cargo-features = ["codegen-backend"]
-
-[package]
-name = "example"
-version = "0.1.0"
-edition = "2024"
-
-[profile.dev]
-codegen-backend = "cranelift"

templates/rust/flake.nix

@@ -2,7 +2,14 @@
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
     flake-parts.url = "github:hercules-ci/flake-parts";
-    rust-overlay.url = "github:oxalica/rust-overlay";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    # wild = {
+    #   url = "github:davidlattimore/wild";
+    #   inputs.nixpkgs.follows = "nixpkgs";
+    # };
   };
 
   outputs = inputs:
@@ -39,7 +46,8 @@
 
         mkDevShell = rustc:
           pkgs.mkShell.override {
-            stdenv = pkgs.stdenvAdapters.useMoldLinker pkgs.clangStdenv;
+            stdenv = pkgs.stdenvAdapters.useMoldLinker pkgs.stdenv;
+            # stdenv = pkgs.useWildLinker pkgs.stdenv;
           } {
             shellHook = ''
               export RUST_SRC_PATH=${pkgs.rustPlatform.rustLibSrc}
@@ -50,7 +58,10 @@
       in {
         _module.args.pkgs = import inputs.nixpkgs {
           inherit system;
-          overlays = [(import inputs.rust-overlay)];
+          overlays = [
+            (import inputs.rust-overlay)
+            # inputs.wild.overlays.default
+          ];
         };
 
         packages.default = self'.packages.example;
@@ -58,10 +69,20 @@
 
         packages.example = rustPackage "";
 
-        devShells.nightly = mkDevShell ((pkgs.rust-bin.selectLatestNightlyWith
-          (toolchain: toolchain.default)).override {
-          extensions = ["rustc-codegen-cranelift-preview"];
-        });
+        devShells.nightly = let
+          nightly = (pkgs.rust-bin.selectLatestNightlyWith
+            (toolchain: toolchain.default)).override {
+            extensions = ["rustc-codegen-cranelift-preview"];
+          };
+          devShell = mkDevShell nightly;
+        in
+          devShell.overrideAttrs (old: {
+            shellHook =
+              old.shellHook or ""
+              + ''
+                export RUSTFLAGS="-Zcodegen-backend=cranelift"
+              '';
+          });
         devShells.stable = mkDevShell pkgs.rust-bin.stable.latest.default;
         devShells.msrv = mkDevShell pkgs.rust-bin.stable.${msrv}.default;
       };

templates/rust/src/main.rs

@@ -1,3 +0,0 @@
-fn main() {
-    println!("Hello World!")
-}