diff --git a/pkgs/build-support/writers/test.nix b/pkgs/build-support/writers/test.nix
index 561c3e4ab002..9484f8bbe31b 100644
--- a/pkgs/build-support/writers/test.nix
+++ b/pkgs/build-support/writers/test.nix
@@ -12,29 +12,49 @@
 }:
 with writers;
 let
+  expectSuccess = test:
+    runCommand "run-${test.name}" {} ''
+      if test "$(${test})" != "success"; then
+        echo 'test ${test.name} failed'
+        exit 1
+      fi
 
-  bin = {
-    bash = writeBashBin "test-writers-bash-bin" ''
+      touch $out
+    '';
+
+  expectSuccessBin = test:
+    runCommand "run-${test.name}" {} ''
+      if test "$(${lib.getExe test})" != "success"; then
+        echo 'test ${test.name} failed'
+        exit 1
+      fi
+
+      touch $out
+    '';
+in
+lib.recurseIntoAttrs {
+  bin = lib.recurseIntoAttrs {
+    bash = expectSuccessBin (writeBashBin "test-writers-bash-bin" ''
      if [[ "test" == "test" ]]; then echo "success"; fi
-    '';
+    '');
 
-    dash = writeDashBin "test-writers-dash-bin" ''
+    dash = expectSuccessBin (writeDashBin "test-writers-dash-bin" ''
      test '~' = '~' && echo 'success'
-    '';
+    '');
 
-    fish = writeFishBin "test-writers-fish-bin" ''
+    fish = expectSuccessBin (writeFishBin "test-writers-fish-bin" ''
       if test "test" = "test"
         echo "success"
       end
-    '';
+    '');
 
-    rust = writeRustBin "test-writers-rust-bin" {} ''
+    rust = expectSuccessBin (writeRustBin "test-writers-rust-bin" {} ''
       fn main(){
         println!("success")
       }
-    '';
+    '');
 
-    haskell = writeHaskellBin "test-writers-haskell-bin" { libraries = [ haskellPackages.acme-default ]; } ''
+    haskell = expectSuccessBin (writeHaskellBin "test-writers-haskell-bin" { libraries = [ haskellPackages.acme-default ]; } ''
       import Data.Default
 
       int :: Int
@@ -44,9 +64,9 @@ let
       main = case int of
         18871 -> putStrLn $ id "success"
         _ -> print "fail"
-    '';
+    '');
 
-    js = writeJSBin "test-writers-js-bin" { libraries = [ nodePackages.semver ]; } ''
+    js = expectSuccessBin (writeJSBin "test-writers-js-bin" { libraries = [ nodePackages.semver ]; } ''
       var semver = require('semver');
 
       if (semver.valid('1.2.3')) {
@@ -54,59 +74,57 @@ let
       } else {
         console.log('fail')
       }
-    '';
+    '');
 
-    perl = writePerlBin "test-writers-perl-bin" { libraries = [ perlPackages.boolean ]; } ''
+    perl = expectSuccessBin (writePerlBin "test-writers-perl-bin" { libraries = [ perlPackages.boolean ]; } ''
       use boolean;
       print "success\n" if true;
-    '';
+    '');
 
-    pypy2 = writePyPy2Bin "test-writers-pypy2-bin" { libraries = [ pypy2Packages.enum ]; } ''
+    pypy2 = expectSuccessBin (writePyPy2Bin "test-writers-pypy2-bin" { libraries = [ pypy2Packages.enum ]; } ''
       from enum import Enum
 
-
       class Test(Enum):
           a = "success"
 
-
       print Test.a
-    '';
+    '');
 
-    python3 = writePython3Bin "test-writers-python3-bin" { libraries = [ python3Packages.pyyaml ]; } ''
+    python3 = expectSuccessBin (writePython3Bin "test-writers-python3-bin" { libraries = [ python3Packages.pyyaml ]; } ''
       import yaml
 
-      y = yaml.load("""
+      y = yaml.safe_load("""
         - test: success
       """)
       print(y[0]['test'])
-    '';
+    '');
 
-    pypy3 = writePyPy3Bin "test-writers-pypy3-bin" { libraries = [ pypy3Packages.pyyaml ]; } ''
+    pypy3 = expectSuccessBin (writePyPy3Bin "test-writers-pypy3-bin" { libraries = [ pypy3Packages.pyyaml ]; } ''
       import yaml
 
-      y = yaml.load("""
+      y = yaml.safe_load("""
         - test: success
       """)
       print(y[0]['test'])
-    '';
+    '');
   };
 
-  simple = {
-    bash = writeBash "test-writers-bash" ''
+  simple = lib.recurseIntoAttrs {
+    bash = expectSuccess (writeBash "test-writers-bash" ''
      if [[ "test" == "test" ]]; then echo "success"; fi
-    '';
+    '');
 
-    dash = writeDash "test-writers-dash" ''
+    dash = expectSuccess (writeDash "test-writers-dash" ''
      test '~' = '~' && echo 'success'
-    '';
+    '');
 
-    fish = writeFish "test-writers-fish" ''
+    fish = expectSuccess (writeFish "test-writers-fish" ''
       if test "test" = "test"
         echo "success"
       end
-    '';
+    '');
 
-    haskell = writeHaskell "test-writers-haskell" { libraries = [ haskellPackages.acme-default ]; } ''
+    haskell = expectSuccess (writeHaskell "test-writers-haskell" { libraries = [ haskellPackages.acme-default ]; } ''
       import Data.Default
 
       int :: Int
@@ -116,9 +134,9 @@ let
       main = case int of
         18871 -> putStrLn $ id "success"
         _ -> print "fail"
-    '';
+    '');
 
-    js = writeJS "test-writers-js" { libraries = [ nodePackages.semver ]; } ''
+    js = expectSuccess (writeJS "test-writers-js" { libraries = [ nodePackages.semver ]; } ''
       var semver = require('semver');
 
       if (semver.valid('1.2.3')) {
@@ -126,43 +144,41 @@ let
       } else {
         console.log('fail')
       }
-    '';
+    '');
 
-    perl = writePerl "test-writers-perl" { libraries = [ perlPackages.boolean ]; } ''
+    perl = expectSuccess (writePerl "test-writers-perl" { libraries = [ perlPackages.boolean ]; } ''
       use boolean;
       print "success\n" if true;
-    '';
+    '');
 
-    pypy2 = writePyPy2 "test-writers-pypy2" { libraries = [ pypy2Packages.enum ]; } ''
+    pypy2 = expectSuccess (writePyPy2 "test-writers-pypy2" { libraries = [ pypy2Packages.enum ]; } ''
       from enum import Enum
 
-
       class Test(Enum):
           a = "success"
 
-
       print Test.a
-    '';
+    '');
 
-    python3 = writePython3 "test-writers-python3" { libraries = [ python3Packages.pyyaml ]; } ''
+    python3 = expectSuccess (writePython3 "test-writers-python3" { libraries = [ python3Packages.pyyaml ]; } ''
       import yaml
 
-      y = yaml.load("""
+      y = yaml.safe_load("""
         - test: success
       """)
       print(y[0]['test'])
-    '';
+    '');
 
-    pypy3 = writePyPy3 "test-writers-pypy3" { libraries = [ pypy3Packages.pyyaml ]; } ''
+    pypy3 = expectSuccess (writePyPy3 "test-writers-pypy3" { libraries = [ pypy3Packages.pyyaml ]; } ''
       import yaml
 
-      y = yaml.load("""
+      y = yaml.safe_load("""
         - test: success
       """)
       print(y[0]['test'])
-    '';
+    '');
 
-    fsharp = makeFSharpWriter {
+    fsharp = expectSuccess (makeFSharpWriter {
       libraries = { fetchNuGet }: [
         (fetchNuGet { pname = "FSharp.SystemTextJson"; version = "0.17.4"; sha256 = "1bplzc9ybdqspii4q28l8gmfvzpkmgq5l1hlsiyg2h46w881lwg2"; })
       ];
@@ -183,31 +199,31 @@ let
       then "success"
       else "failed"
       |> printfn "%s"
-    '';
+    '');
 
-    pypy2NoLibs = writePyPy2 "test-writers-pypy2-no-libs" {} ''
+    pypy2NoLibs = expectSuccess (writePyPy2 "test-writers-pypy2-no-libs" {} ''
       print("success")
-    '';
+    '');
 
-    python3NoLibs = writePython3 "test-writers-python3-no-libs" {} ''
+    python3NoLibs = expectSuccess (writePython3 "test-writers-python3-no-libs" {} ''
       print("success")
-    '';
+    '');
 
-    pypy3NoLibs = writePyPy3 "test-writers-pypy3-no-libs" {} ''
+    pypy3NoLibs = expectSuccess (writePyPy3 "test-writers-pypy3-no-libs" {} ''
       print("success")
-    '';
+    '');
 
-    fsharpNoNugetDeps = writeFSharp "test-writers-fsharp-no-nuget-deps" ''
+    fsharpNoNugetDeps = expectSuccess (writeFSharp "test-writers-fsharp-no-nuget-deps" ''
       printfn "success"
-    '';
+    '');
   };
 
-
-  path = {
-    bash = writeBash "test-writers-bash-path" (writeText "test" ''
+  path = lib.recurseIntoAttrs {
+    bash = expectSuccess (writeBash "test-writers-bash-path" (writeText "test" ''
       if [[ "test" == "test" ]]; then echo "success"; fi
-    '');
-    haskell = writeHaskell "test-writers-haskell-path" { libraries = [ haskellPackages.acme-default ]; } (writeText "test" ''
+    ''));
+
+    haskell = expectSuccess (writeHaskell "test-writers-haskell-path" { libraries = [ haskellPackages.acme-default ]; } (writeText "test" ''
       import Data.Default
 
       int :: Int
@@ -217,26 +233,6 @@ let
       main = case int of
         18871 -> putStrLn $ id "success"
         _ -> print "fail"
-    '');
+    ''));
   };
-
-  writeTest = expectedValue: name: test:
-    writeDash "run-${name}" ''
-      if test "$(${test})" != "${expectedValue}"; then
-        echo 'test ${test} failed'
-        exit 1
-      fi
-    '';
-
-in runCommand "test-writers" {
-  passthru = { inherit writeTest bin simple path; };
-  meta.platforms = lib.platforms.all;
-} ''
-  ${lib.concatMapStringsSep "\n" (test: writeTest "success" test.name "${test}/bin/${test.name}") (lib.attrValues bin)}
-  ${lib.concatMapStringsSep "\n" (test: writeTest "success" test.name test) (lib.attrValues simple)}
-  ${lib.concatMapStringsSep "\n" (test: writeTest "success" test.name test) (lib.attrValues path)}
-
-  echo 'nix-writers successfully tested' >&2
-  touch $out
-''
-
+}
diff --git a/pkgs/test/haskell/default.nix b/pkgs/test/haskell/default.nix
index 86764380ecc3..2ecbd4caf81b 100644
--- a/pkgs/test/haskell/default.nix
+++ b/pkgs/test/haskell/default.nix
@@ -5,6 +5,5 @@ lib.recurseIntoAttrs {
   cabalSdist = callPackage ./cabalSdist { };
   documentationTarball = callPackage ./documentationTarball { };
   setBuildTarget = callPackage ./setBuildTarget { };
-  writers = callPackage ./writers { };
   incremental = callPackage ./incremental { };
 }
diff --git a/pkgs/test/haskell/writers/default.nix b/pkgs/test/haskell/writers/default.nix
deleted file mode 100644
index f05fda4bc736..000000000000
--- a/pkgs/test/haskell/writers/default.nix
+++ /dev/null
@@ -1,26 +0,0 @@
-# Wrap only the haskell-related tests from tests.writers
-# in their own derivation for Hydra CI in the haskell-updates
-# jobset. Can presumably removed as soon as tests.writers is
-# always green on darwin as well:
-# https://github.com/NixOS/nixpkgs/issues/126182
-{ runCommand, tests }:
-
-let
-  inherit (tests.writers)
-    writeTest
-    bin
-    simple
-    path
-    ;
-in
-
-runCommand "test-haskell-writers" {
-  meta = {
-    inherit (tests.writers.meta) platforms;
-  };
-} ''
-  ${writeTest "success" "test-haskell-bin-writer" "${bin.haskell}/bin/${bin.haskell.name}"}
-  ${writeTest "success" "test-haskell-simple-writer" simple.haskell}
-  ${writeTest "success" "test-haskell-path-writer" path.haskell}
-  touch $out
-''