nixVersions.nix_2_26: Add .overrideScope

    */

    overrideSource = src: (scope.overrideSource src).nix-everything;

    /**

      Override any internals of the Nix package set.

      Single argument: the extension function to apply to the package set (finalScope: prevScope: { ... })

      Example:

      ```

      overrideScope (finalScope: prevScope: { aws-sdk-cpp = null; })

      ```

    */

    overrideScope = f: (scope.overrideScope f).nix-everything;

  };

}