Supply a name to cleanSourceWith to suppress build-time warning:

> trace: WARNING: `cleanSourceWith` called on /nix/store/l74k6l0sw0dfqnykxxa9zazlbxkqdb8n-source without a `name`. Consider adding `name = "l74k6l0sw0dfqnykxxa9zazlbxkqdb8n-source";`
 
I cargo-culted this from https://input-output-hk.github.io/haskell.nix/tutorials/getting-started.html#scaffolding , hoping it does the right thing. 

nix/default.nix

@@ -17,6 +17,8 @@ let
     haskellNix.sources.nixpkgs-2111 haskellNix.nixpkgsArgs;
 in
   pkgs.haskell-nix.project {
+    src = pkgs.haskell-nix.haskellLib.cleanGit { 
       name = "LeaseReport";
       src = ../.;
+    };
   }