rustell wasm target works, flake shell small fix

Author: functora

rust/flake.lock

@@ -3,12 +3,14 @@
 
   inputs = {
     nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-25.05";
+    rust-overlay.url = "github:oxalica/rust-overlay";
     flake-utils.url = "github:numtide/flake-utils";
   };
 
   outputs = {
     self,
     nixpkgs,
+    rust-overlay,
     flake-utils,
   }:
     flake-utils.lib.eachDefaultSystem (
@@ -20,6 +22,34 @@
             src = pkgs.nix-gitignore.gitignoreSource [] ./${pkg};
             cargoLock.lockFile = ./${pkg}/Cargo.lock;
           };
+        mkRustPkgWasm = pkg: let
+          buildTarget = "wasm32-wasip1";
+          pkgs = import nixpkgs {
+            inherit system;
+            overlays = [rust-overlay.overlays.default];
+          };
+          rustToolchain = pkgs.rust-bin.stable.latest.default.override {
+            targets = [buildTarget];
+          };
+          rustPlatform = pkgs.makeRustPlatform {
+            cargo = rustToolchain;
+            rustc = rustToolchain;
+          };
+        in
+          rustPlatform.buildRustPackage {
+            name = pkg;
+            src = pkgs.nix-gitignore.gitignoreSource [] ./${pkg};
+            cargoLock.lockFile = ./${pkg}/Cargo.lock;
+            buildPhase = ''
+              cargo build --release -p ${pkg} --target=${buildTarget}
+            '';
+            installPhase = ''
+              mkdir -p $out/lib
+              cp target/${buildTarget}/release/*.wasm $out/lib/
+            '';
+            # Disable checks if they only work for WASM
+            # doCheck = false;
+          };
       in {
         devShells.default = pkgs.mkShell {
           packages = with pkgs; [
@@ -31,10 +61,15 @@
             rust-analyzer
             rustc
             rustfmt
+            wasmtime
           ];
+          shellHook = ''
+            SHELL=/run/current-system/sw/bin/bash
+          '';
         };
         packages = {
           rustell = mkRustPkg "rustell";
+          rustell-wasm = mkRustPkgWasm "rustell";
           default = self.packages.${system}.rustell;
         };
       }

rust/flake.nix

@@ -22,7 +22,7 @@ fn expr_use<'a>(
     top: bool,
     ast: &'a ExprUse<'a>,
 ) -> IntoIter<&'a str> {
-    let x0 = if top { vec!["use"] } else { vec![] };
+    let x0 = if top { vec!["use "] } else { vec![] };
 
     let x1 = match ast {
         ExprUse::Item {