{
  description = "iamb";
  nixConfig.bash-prompt = "\[nix-develop\]$ ";

  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    crane.url = "github:ipetkov/crane";
    fenix = {
      url = "github:nix-community/fenix";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    {
      self,
      nixpkgs,
      crane,
      flake-utils,
      fenix,
      ...
    }:
    flake-utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = nixpkgs.legacyPackages.${system};
        inherit (pkgs) lib;

        rustToolchain = fenix.packages.${system}.fromToolchainFile {
          file = ./rust-toolchain.toml;
          # When the file changes, this hash must be updated.
          sha256 = "sha256-Qxt8XAuaUR2OMdKbN4u8dBJOhSHxS+uS06Wl9+flVEk=";
        };

        # Nightly toolchain for rustfmt (pinned to current flake lock)
        # Note that the github CI uses "current nightly" for formatting, it 's not pinned.
        rustNightly = fenix.packages.${system}.latest;

        craneLib = (crane.mkLib pkgs).overrideToolchain rustToolchain;
        craneLibNightly = (crane.mkLib pkgs).overrideToolchain rustNightly.toolchain;

        src = lib.fileset.toSource {
          root = ./.;
          fileset = lib.fileset.unions [
            (craneLib.fileset.commonCargoSources ./.)
            ./src/windows/welcome.md
          ];
        };

        commonArgs = {
          inherit src;
          strictDeps = true;
          pname = "iamb";
          version = self.shortRev or self.dirtyShortRev;
        };

        # Build *just* the cargo dependencies, so we can reuse
        # all of that work (e.g. via cachix) when running in CI
        cargoArtifacts = craneLib.buildDepsOnly commonArgs;

        # Build the actual crate
        iamb = craneLib.buildPackage (commonArgs // {
          inherit cargoArtifacts;
        });
      in
      {
        checks = {
          # Build the crate as part of `nix flake check`
          inherit iamb;

          iamb-clippy = craneLib.cargoClippy (commonArgs // {
            inherit cargoArtifacts;
            cargoClippyExtraArgs = "--all-targets -- --deny warnings";
          });

          iamb-fmt = craneLibNightly.cargoFmt {
            inherit src;
          };

          iamb-nextest = craneLib.cargoNextest (commonArgs // {
            inherit cargoArtifacts;
            partitions = 1;
            partitionType = "count";
          });
        };

        packages.default = iamb;

        apps.default = flake-utils.lib.mkApp {
          drv = iamb;
        };

        devShells.default = craneLib.devShell {
          # Inherit inputs from checks
          checks = self.checks.${system};

          packages = with pkgs; [
            cargo-tarpaulin
            cargo-watch
            sqlite
          ];

          shellHook = ''
            # Prepend nightly rustfmt to PATH.
            export PATH="${rustNightly.rustfmt}/bin:$PATH"
          '';
        };
      }
    );
}