Hey folks! I'm trying to get miri to work on Nix Darwin.

I am using rust-overlay for my devShell:

      let
        overlays = [ rust-overlay.overlays.default ];
        pkgs = import nixpkgs { inherit system overlays; };
        llvm = pkgs.llvmPackages_20;
      in
      {
        devShells.default = pkgs.mkShell {
          buildInputs = with pkgs; [
            (rust-bin.selectLatestNightlyWith (
              toolchain:
              toolchain.default.override {
                extensions = [ "rust-src" "miri" "rustc-dev" ];
              }
            ))
            llvm.llvm
            llvm.libllvm
            llvm.clang
            llvm.lld
            pkg-config
            libffi
            libxml2
            nixfmt
          ];

          LLVM_SYS_201_PREFIX = llvm.llvm.dev;
        };

When I execute miri, it seems to believe it can't find cargo-miri:

$ cargo miri run
error: 'cargo-miri' is not installed for the toolchain 'nightly-aarch64-apple-darwin'.
To install, run `rustup component add miri`

I do still see cargo-miri and miri in my Nix store:

ls $(which cargo | xargs dirname)
cargo cargo-miri miri ...(etc)

Anyone got any insight?

are there any tricks for speeding up local build times for rust packages in nixpkgs?

...
┏━ Dependency Graph:
┃ ✔ stalwart-0.15.3 ⏱ 21m29s
┣━━━ Builds
┗━ ∑ ⏵ 0 │ ✔ 1 │ ⏸ 0 │ Finished at 22:18:53 after 21m38s

20 minutes is wild