{
  pkgs,
  fenix,
  selfPkgs,
  ...
}:
(builtins.mapAttrs (
  packageName: package:
  pkgs.mkShell {
    inputsFrom = [ package ];
    packages = with pkgs; [
      rustfmt
      clippy
      cargo-expand
      cargo-tarpaulin
      gdb
    ];

    RUST_BACKTRACE = 1;
    RUST_LOG = "all";
  }
) selfPkgs)
// {
  test = pkgs.mkShell {
    packages = with pkgs; [
      (pkgs.symlinkJoin {
        name = "rust-toolchain";
        paths = with pkgs; [
          rustc
          cargo
          rustPlatform.rustcSrc
          rustPlatform.rustLibSrc
          rustfmt
          clippy
          cargo-expand
          cargo-tarpaulin
        ];
      })
      gcc
      gnumake
      xe
      libgcc
      libunwind
      pkgsStatic.gcc
      pkgsStatic.libgcc
      pkgsStatic.musl
    ];

    RUST_SRC_PATH = "${pkgs.rustPlatform.rustLibSrc}";
  };
}