shellFor: only depends on hsc2hs from ghcEnv to avoid collisions

Author: jbgi

builder/shell-for.nix

@@ -167,7 +167,9 @@ in
     buildInputs = systemInputs
       ++ mkDrvArgs.buildInputs or [];
     nativeBuildInputs = [ ghcEnv ]
-      ++ nativeBuildInputs
+      # We remove hsc2hs from dependencies provided by packages `build-tools`
+      # since it is already provided by `ghcEnv` (avoid collision with using devshell).
+      ++ (lib.filter (p: p.pname or "" != "hsc2hs-exe-hsc2hs") nativeBuildInputs)
       ++ mkDrvArgs.nativeBuildInputs or []
       ++ lib.attrValues (buildPackages.haskell-nix.tools' evalPackages compiler.nix-name tools)
       # If this shell is a cross compilation shell include