rec {
  rust-toolchain = pkgs: pkgs.rust-bin.fromRustupToolchainFile ../rust-toolchain.toml;

  toolchain-pkgs = pkgs:
    pkgs.extend (_: _: {
      rustPlatform = pkgs.makeRustPlatform {
        cargo = rust-toolchain pkgs;
        rustc = rust-toolchain pkgs;
      };
    });

  toolchain-crosspkgs = pkgs: let
    crossPkgs = pkgs.pkgsCross.wasm32-unknown-none;
  in
    crossPkgs.extend (_: _: {
      rustPlatform = crossPkgs.makeRustPlatform {
        cargo = rust-toolchain pkgs;
        rustc = rust-toolchain pkgs;
      };
    });
}