% nix run github:astro/deadnix -- --edit --no-lambda-pattern-names --exclude ./materialized (input-output-hk#1756)

Author: yvan-sraka

builder/comp-builder.nix

@@ -620,7 +620,7 @@ let
               lib.optionals (builtins.compareVersions defaults.ghc.version "9.4.1" >= 0)
                 [ buildPackages.gcc-unwrapped
                   # Find the versions of mcfgthreads used by stdenv.cc
-                  (pkgs.threadsCrossFor or (x: { package = pkgs.windows.mcfgthreads; }) pkgs.stdenv.cc.version).package
+                  (pkgs.threadsCrossFor or (_x: { package = pkgs.windows.mcfgthreads; }) pkgs.stdenv.cc.version).package
                 ])}; do
           find "$p" -iname '*.dll' -exec ln -s {} $out/bin \;
         done

builder/haddock-builder.nix

@@ -121,9 +121,7 @@ let
     '';
 
     installPhase =
-      let
-        target-pkg-and-db = "${ghc.targetPrefix}ghc-pkg -v0 --package-db $out/package.conf.d";
-      in ''
+      ''
         html="dist/doc/html/${package.identifier.name}"
 
         if [ -d "$html" ]; then

builder/make-config-files.nix

@@ -37,11 +37,7 @@ let
   #            pkg id for z-{pkg name}-z-{sublib name}.  As we do not provide the
   #            sublib name to exactDep, as we don't have access to it at the call-site,
   #            we resort to a bit of globbing, which (as pkg db's should contain only
-  #            a single package) work.
-
-  getLibComponent = dep:
-       dep.components.library # Regular package dependency
-    or dep;                   # or a sublib
+  #            a single package) work.                   # or a sublib
 
   # Work our suitable packageCfgDir subdirectory
   isGhcjs        = ghc.isGhcjs or false;

ci-lib.nix

@@ -20,7 +20,7 @@ rec {
   # Keep derivations and attrsets with 'recurseForDerivations'. This ensures that we match the
   # derivations that Hercules will see, and prevents Hydra from trying to pick up all sorts of bad stuff
   # (like attrsets that contain themselves!).
-  filterDerivations = filterAttrsOnlyRecursive (n: attrs: lib.isDerivation attrs || attrs.recurseForDerivations or false);
+  filterDerivations = filterAttrsOnlyRecursive (_n: attrs: lib.isDerivation attrs || attrs.recurseForDerivations or false);
 
   # A version of 'filterAttrsRecursive' that doesn't recurse into derivations. This prevents us from going into an infinite
   # loop with the 'out' attribute on derivations.

ci.nix

@@ -31,7 +31,7 @@
     # set checkMaterialization as per top-level argument
     overlays = [
       haskellNix.overlay
-      (final: prev: {
+      (_final: prev: {
         haskell-nix = prev.haskell-nix // {
           inherit checkMaterialization;
         };
@@ -62,7 +62,7 @@
         (system != "aarch64-linux" || (
            !builtins.elem compiler-nix-name ["ghc865" "ghc8104" "ghc810420210212" "ghc8105" "ghc8106" "ghc901" "ghc921" "ghc922"]
         )))
-    (builtins.mapAttrs (compiler-nix-name: runTests: {
+    (builtins.mapAttrs (_compiler-nix-name: runTests: {
       inherit runTests;
     }) (
       # GHC version to cache and whether to run the tests against them.

compiler/ghc/default.nix

@@ -113,7 +113,7 @@ let
     let targetLibffi = targetPackages.libffi or libffi; in
     # we need to set `dontDisableStatic` for musl for libffi to work.
     if stdenv.targetPlatform.isMusl
-    then targetLibffi.overrideAttrs (old: { dontDisableStatic = true; })
+    then targetLibffi.overrideAttrs (_old: { dontDisableStatic = true; })
     else targetLibffi;
 
   targetGmp = targetPackages.gmp or gmp;

default.nix

@@ -55,7 +55,7 @@ let
   # coming from internal.compat
   overlays = [ self.overlay ]
     ++ lib.optional checkMaterialization
-    (final: prev: {
+    (_final: prev: {
       haskell-nix = prev.haskell-nix // {
         checkMaterialization = true;
       };

docs/tutorials/getting-started-flakes/flake.nix

@@ -7,7 +7,7 @@
     flake-utils.lib.eachSystem [ "x86_64-linux" "x86_64-darwin" ] (system:
     let
       overlays = [ haskellNix.overlay
-        (final: prev: {
+        (final: _prev: {
           # This overlay adds our project to pkgs
           helloProject =
             final.haskell-nix.project' {

hix/init/flake.nix

@@ -15,7 +15,7 @@
       flake-utils.lib.eachSystem supportedSystems (system:
       let
         overlays = [ haskellNix.overlay
-          (final: prev: {
+          (final: _prev: {
             hixProject =
               final.haskell-nix.hix.project {
                 src = ./.;

hix/project/flake.nix

@@ -10,7 +10,7 @@
     flake-utils.lib.eachSystem [ "EVAL_SYSTEM" ] (system:
     let
       overlays = [ haskellNix.overlay
-        (final: prev: {
+        (final: _prev: {
           hixProject =
             final.haskell-nix.hix.project {
               inherit src;