Try #1570:

Author: iohk-bors[bot]

builder/shell-for.nix

@@ -152,7 +152,7 @@ in
     nativeBuildInputs = [ ghcEnv ]
       ++ nativeBuildInputs
       ++ mkDrvArgs.nativeBuildInputs or []
-      ++ lib.attrValues (buildPackages.haskell-nix.tools evalPackages compiler.nix-name tools)
+      ++ lib.attrValues (buildPackages.haskell-nix.tools' evalPackages compiler.nix-name tools)
       # If this shell is a cross compilation shell include
       # wrapper script for running cabal build with appropriate args.
       # Includes `--with-compiler` in case the `cabal.project` file has `with-compiler:` in it.

overlays/haskell.nix

@@ -496,8 +496,8 @@ final: prev: {
                   inherit pkg-set;
                   plan-nix = callProjectResults.projectNix;
                   inherit (callProjectResults) index-state;
-                  tool = final.buildPackages.haskell-nix.tool pkg-set.config.compiler.nix-name;
-                  tools = final.buildPackages.haskell-nix.tools pkg-set.config.compiler.nix-name;
+                  tool = final.buildPackages.haskell-nix.tool' evalPackages pkg-set.config.compiler.nix-name;
+                  tools = final.buildPackages.haskell-nix.tools' evalPackages pkg-set.config.compiler.nix-name;
                   roots = final.haskell-nix.roots pkg-set.config.compiler.nix-name;
                   projectFunction = haskell-nix: haskell-nix.cabalProject';
                   inherit projectModule buildProject args;
@@ -788,8 +788,8 @@ final: prev: {
                   inherit (pkg-set.config) hsPkgs;
                   inherit pkg-set;
                   stack-nix = callProjectResults.projectNix;
-                  tool = final.buildPackages.haskell-nix.tool pkg-set.config.compiler.nix-name;
-                  tools = final.buildPackages.haskell-nix.tools pkg-set.config.compiler.nix-name;
+                  tool = final.buildPackages.haskell-nix.tool' evalPackages pkg-set.config.compiler.nix-name;
+                  tools = final.buildPackages.haskell-nix.tools' evalPackages pkg-set.config.compiler.nix-name;
                   roots = final.haskell-nix.roots pkg-set.config.compiler.nix-name;
                   projectFunction = haskell-nix: haskell-nix.stackProject';
                   inherit projectModule buildProject args;

overlays/tools.nix

@@ -77,12 +77,16 @@ in { haskell-nix = prev.haskell-nix // {
   tool = compiler-nix-name: name: versionOrMod:
       final.haskell-nix.hackage-tool (
            final.haskell-nix.haskellLib.versionOrModToMods versionOrMod
-        ++ [{ inherit compiler-nix-name name; }]
+        ++ [(lib.mapAttrs (_: lib.mkOverride 1100) { inherit compiler-nix-name name; })]
       );
 
-  tools = evalPackages: compiler-nix-name:
-    lib.mapAttrs (name: versionOrMod:
+  # tool with a default evalPackages to use.
+  tool' = evalPackages: compiler-nix-name: name: versionOrMod:
       final.haskell-nix.hackage-tool (
            final.haskell-nix.haskellLib.versionOrModToMods versionOrMod
-        ++ [{ inherit evalPackages compiler-nix-name name; }]));
+        ++ [(lib.mapAttrs (_: lib.mkOverride 1100) { inherit evalPackages compiler-nix-name name; })]
+      );
+
+  tools = compiler-nix-name: lib.mapAttrs (final.haskell-nix.tool compiler-nix-name);
+  tools' = evalPackages: compiler-nix-name: lib.mapAttrs (final.haskell-nix.tool' evalPackages compiler-nix-name);
 }; }