improve miri wrapper

mill-scale.nix

@@ -10,7 +10,7 @@
   ...
 }: let
   inherit (builtins) elem readFile pathExists match any concatLists;
-  inherit (lib) getExe map mkDefault mkIf mkMerge mkOption warnIf optionalAttrs types optionalString genAttrs hasInfix optionals;
+  inherit (lib) getExe map mkDefault mkIf mkMerge mkOption warnIf optionalAttrs types optionalString genAttrs hasInfix makeBinPath;
   inherit (lib.fileset) fileFilter toSource unions;
   inherit (flakelight.types) fileset function optFunctionTo;
 
@@ -368,9 +368,23 @@ in
         apps = {
           cargo-miri,
           cargo-semver-checks,
+          miriRustToolchain,
+          writeShellApplication,
           ...
-        }: {
+        } @ pkgs: let
-          miri = "${cargo-miri}/bin/cargo-miri";
+          deps =
+            (buildDeps pkgs).buildInputs
+            ++ (buildDeps pkgs).nativeBuildInputs
+            ++ [pkgs.stdenv.cc];
+          miriWrapped = writeShellApplication {
+            name = "cargo-miri";
+            runtimeInputs = [miriRustToolchain];
+            text = ''
+              PATH="$PATH:${makeBinPath deps}"  cargo miri "$@"
+            '';
+          };
+        in {
+          miri = "${miriWrapped}/bin/cargo-miri";
           semver-checks = "${cargo-semver-checks}/bin/cargo-semver-checks semver-checks";
         };
       })