Use input-output-hk#2379

Author: hamishmack

hix/project/flake.nix

@@ -5,7 +5,7 @@
   inputs.haskellNix.url = "github:input-output-hk/haskell.nix";
   inputs.nixpkgs.follows = "haskellNix/nixpkgs-unstable";
   inputs.flake-utils.url = "github:numtide/flake-utils";
-  inputs.projectArgs.url = "github:input-output-hk/empty-flake";
+  inputs.projectArgs.url = "github:input-output-hk/haskell.nix?dir=hix/empty-set";
   inputs.projectArgs.flake = false;
   inputs.src.flake = false;
   outputs = { self, src, nixpkgs, flake-utils, haskellNix, projectArgs }:
@@ -16,7 +16,7 @@
           hixProject =
             final.haskell-nix.hix.project ({
               inherit src;
-            } // builtins.removeAttrs (import projectArgs) ["outputs"] );
+            } // import projectArgs);
         })
       ];
       pkgs = import nixpkgs { inherit system overlays; inherit (haskellNix) config; };