{ pkgs ? (import <nixpkgs> {}) }:

let
  date = "2020-03-31";
in
let
  rust-channel = pkgs.callPackage ./rust-channel.nix { inherit date; };
  rustPlatform = pkgs.makeRustPlatform {
    cargo = rust-channel.rust;
    rustc = rust-channel.rust;
  };
in
let
  buildRustCrate = pkgs.buildRustCrate.override {
    cargo = rust-channel.rust;
    rustc = rust-channel.rust;};
in
pkgs.callPackage ./Cargo.nix {
  inherit buildRustCrate;
  defaultCrateOverrides = pkgs.defaultCrateOverrides // {
      lixiangyuan = attrs: {
        buildInputs = [ pkgs.wasm-pack ];
      };
    };
}