Use one lib

nixpkgs.lib does not depend on the system

Author: andreabedini

flake.nix

@@ -70,6 +70,8 @@
       compiler = "ghc928";
       config = import ./config.nix;
 
+      inherit (nixpkgs) lib;
+
       traceNames = prefix: builtins.mapAttrs (n: v:
         if builtins.isAttrs v
           then if v ? type && v.type == "derivation"
@@ -88,7 +90,7 @@
         "aarch64-darwin"
       ];
 
-      forEachSystem = nixpkgs.lib.genAttrs systems;
+      forEachSystem = lib.genAttrs systems;
 
     in traceHydraJobs ({
       inherit config;
@@ -124,7 +126,7 @@
             # flake outputs so that we can incorporate the args passed
             # to the compat layer (e.g. sourcesOverride).
             overlays = [ allOverlays.combined ]
-              ++ nixpkgs.lib.optional checkMaterialization
+              ++ lib.optional checkMaterialization
                   (final: prev: {
                     haskell-nix = prev.haskell-nix // {
                       checkMaterialization = true;
@@ -181,8 +183,8 @@
         builtins.listToAttrs (
           map
             (pkg: { name = pkg.name; value = pkg; })
-            (nixpkgs.lib.collect
-              nixpkgs.lib.isDerivation
+            (lib.collect
+              lib.isDerivation
               (import ./test
                 rec {
                   haskellNix = self.internal.compat { inherit system; };
@@ -205,7 +207,6 @@
 
       requiredJobs = forEachSystem (system:
         let
-          inherit (self.legacyPackages.${system}) lib;
           names = x:
             lib.filter
               (n: n != "recurseForDerivations" && n != "meta")