NixOS · sternenseemann · May 31, 2026 · Jun 1, 2026 · Jun 1, 2026 · May 31, 2026
diff --git a/maintainers/scripts/haskell/eval-pkg-sets.sh b/maintainers/scripts/haskell/eval-pkg-sets.sh
@@ -0,0 +1,39 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -i bash
+#!nix-shell -p jq git
+# shellcheck shell=bash
+#
+# Usage: eval-pkg-sets.sh [extra flags for nix-* commands ...]
+#
+# Must be executed in a git checkout of Nixpkgs.
+
+set -euo pipefail
+
+NIXPKGS="$(git rev-parse --show-toplevel)"
+PKGSETS="$(nix-env --readonly-mode --json --drv-path -f "$NIXPKGS" -qaP -A haskell.compiler "$@" \
+  | jq -r 'to_entries | unique_by(.value.drvPath) .[] .key | sub("^haskell.compiler";"haskell.packages")')"
+
+trap 'exit 1' SIGINT SIGTERM
+
+set +e
+
+badsets=""
+for set in $PKGSETS; do
+  # Confirm an equivalent package set to haskell.compiler.$entry exists and is usable
+  if ! nix-instantiate --readonly-mode -A "$set.ghc" "$@" > /dev/null 2>&1; then
+    echo "Skipping $set... ($set.ghc does not evaluate)"
+  else
+    echo "Evaluating $set..."
+
+    if ! nix-env --readonly-mode -f "$NIXPKGS" -qaP --drv-path -A "$set" "$@" > /dev/null; then
+      badsets+="$set "
+    fi
+  fi
+done
+
+if [ -n "$badsets" ]; then
+  echo "Found potential eval issues in the following sets:" >&2
+  # shellcheck disable=SC2086
+  printf '%s\n' $badsets
+  exit 1
+fi
diff --git a/maintainers/scripts/haskell/update-stackage.sh b/maintainers/scripts/haskell/update-stackage.sh
@@ -33,7 +33,7 @@ fi
 
 # Stackage solver to use, LTS or Nightly
 # (should be capitalized like the display name)
-SOLVER=LTS
+SOLVER=Nightly
 # Stackage solver version, if any. Use latest if empty
 VERSION=
 TMP_TEMPLATE=update-stackage.XXXXXXX
@@ -105,6 +105,7 @@ sed -r \
     -e '/ hledger-ui /d' \
     -e '/ hledger-web /d' \
     -e '/ spacecookie /d' \
+    -e '/ hnix-store-core /d' \
     < "${tmpfile_new}" >> $stackage_config
 # Explanations:
 # cabal2nix, distribution-nixpkgs, jailbreak-cabal, language-nix: These are our packages and we know what we are doing.

diff --git a/pkgs/by-name/ko/koka/package.nix b/pkgs/by-name/ko/koka/package.nix
@@ -68,7 +68,7 @@ haskellPackages.mkDerivation {
     hashable
     isocline
     lens
-    lsp_2_8_0_0
+    lsp
     mtl
     network
     network-simple

diff --git a/pkgs/by-name/mk/mkjson/generated.nix b/pkgs/by-name/mk/mkjson/generated.nix
@@ -1,7 +1,7 @@
 {
   mkDerivation,
   lib,
-  fetchFromGitHub,
+  fetchFromCodeberg,
   aeson,
   base,
   bytestring,
@@ -26,7 +26,7 @@
 mkDerivation rec {
   pname = "mkjson";
   version = "0.4.0";
-  src = fetchFromGitHub {
+  src = fetchFromCodeberg {
     owner = "mfussenegger";
     repo = "mkjson";
     rev = "${version}";

diff --git a/pkgs/by-name/mk/mkjson/package.nix b/pkgs/by-name/mk/mkjson/package.nix
@@ -1,2 +1,19 @@
-{ haskell, haskellPackages }:
-haskell.lib.justStaticExecutables (haskellPackages.callPackage ./generated.nix { })
+{
+  haskell,
+  haskellPackages,
+  lib,
+}:
+let
+  inherit (haskell.lib.compose) justStaticExecutables overrideCabal;
+
+  # The mkjson-doctest suite depends on specific RNG results not provided by the
+  # GHC in Nixpkgs as of this writing.
+  overrides = {
+    testTargets = [ "mkjson-test" ];
+  };
+  raw-pkg = haskellPackages.callPackage ./generated.nix { };
+in
+lib.pipe raw-pkg [
+  (overrideCabal overrides)
+  justStaticExecutables
+]
diff --git a/pkgs/data/misc/hackage/pin.json b/pkgs/data/misc/hackage/pin.json
@@ -1,6 +1,6 @@
 {
-  "commit": "3a3b69bdd8114e4503dc8cb9909a3b0ea32e6be6",
-  "url": "https://github.com/commercialhaskell/all-cabal-hashes/archive/3a3b69bdd8114e4503dc8cb9909a3b0ea32e6be6.tar.gz",
-  "sha256": "1qjd5gp9d4r4y6qjf52m7w9dzy9nq622aqv72ma8d4xlrxrrachp",
-  "msg": "Update from Hackage at 2026-04-24T19:35:23Z"
+  "commit": "128a44ac0b050c18f374382cb58308863a87c8ae",
+  "url": "https://github.com/commercialhaskell/all-cabal-hashes/archive/128a44ac0b050c18f374382cb58308863a87c8ae.tar.gz",
+  "sha256": "017146ry5w7jqqdx3xgqwfam3nn0754hv6gmsjv5n00d7hkqz1pi",
+  "msg": "Update from Hackage at 2026-08-09T03:01:25Z"
 }
diff --git a/pkgs/development/compilers/elm/packages/ghc9_8/default.nix b/pkgs/development/compilers/elm/packages/ghc9_8/default.nix
@@ -12,6 +12,11 @@ pkgs.haskell.packages.ghc98.override {
         # https://github.com/avh4/elm-format/blob/e7e5da37716acbfb4954a88128b5cc72b2c911d9/package/nix/generate_derivation.sh
         elm-format = justStaticExecutables (
           overrideCabal (drv: {
+            # jailbreak required due to optparse-applicative bounds
+            # optparse-applicative >=0.17.0.0 && <0.19
+            # upstream PR https://github.com/avh4/elm-format/pull/841
+            jailbreak = true;
+
             postPatch = ''
               mkdir -p ./generated
               cat <<EOHS > ./generated/Build_elm_format.hs
@@ -35,8 +40,14 @@ pkgs.haskell.packages.ghc98.override {
       inherit elmPkgs;
 
       # Needed for elm-format
+
       avh4-lib = self.callPackage ./elm-format/avh4-lib.nix { };
-      elm-format-lib = self.callPackage ./elm-format/elm-format-lib.nix { };
+      # jailbreak required due to optparse-applicative bounds
+      # optparse-applicative >=0.17.0.0 && <0.19
+      # upstream PR https://github.com/avh4/elm-format/pull/841
+      elm-format-lib = pkgs.haskell.lib.doJailbreak (
+        self.callPackage ./elm-format/elm-format-lib.nix { }
+      );
       elm-format-test-lib = self.callPackage ./elm-format/elm-format-test-lib.nix { };
       elm-format-markdown = self.callPackage ./elm-format/elm-format-markdown.nix { };
     };

diff --git a/pkgs/development/compilers/ghc/9.12.5.nix b/pkgs/development/compilers/ghc/9.12.5.nix
@@ -0,0 +1,5 @@
+import ./common-hadrian.nix {
+  version = "9.12.4.20260713";
+  url = "https://downloads.haskell.org/~ghc/9.12.5-rc3/ghc-9.12.4.20260713-src.tar.gz";
+  sha256 = "cc77cff2014dd99c16c9f311f7558d9a11aa3c3a2dee47425b109c3dac35338c";
+}
diff --git a/pkgs/development/compilers/ghc/9.14.2.nix b/pkgs/development/compilers/ghc/9.14.2.nix
@@ -0,0 +1,5 @@
+import ./common-hadrian.nix {
+  url = "https://downloads.haskell.org/~ghc/9.14.2-rc1/ghc-9.14.1.20260728-src.tar.xz";
+  version = "9.14.1.20260728";
+  sha256 = "015543170af3ca4bf3b2c4112a207b4738be72243883cb0dbbe673bcc316a04f";
+}
diff --git a/pkgs/development/compilers/ghc/common-hadrian.nix b/pkgs/development/compilers/ghc/common-hadrian.nix
@@ -118,6 +118,7 @@
         # While split sections are now enabled by default in ghc 8.8 for windows,
         # they seem to lead to `too many sections` errors when building base for
         # profiling.
+        # TODO(@alexfmpe): test split sections again with GHC 9.14.2
         ++ (if stdenv.targetPlatform.isWindows then [ "no_split_sections" ] else [ "split_sections" ]);
     in
     baseFlavour + lib.concatMapStrings (t: "+${t}") transformers,
@@ -309,34 +310,21 @@
       ]
 
       # Fix docs build with Sphinx >= 9 https://gitlab.haskell.org/ghc/ghc/-/issues/26810
-      ++
-        lib.optionals
-          (
-            lib.versionOlder version "9.12.4"
-            || (lib.versionAtLeast version "9.14" && lib.versionOlder version "9.15.20260129")
-          )
-          [
-            ./ghc-9.6-or-later-docs-sphinx-9.patch
-          ]
+      ++ lib.optionals (lib.versionOlder version "9.12.4" || version == "9.14.1") [
+        ./ghc-9.6-or-later-docs-sphinx-9.patch
+      ]
 
       # Fixes rts/Types.h missing from the install when targeting javascript
       # See https://gitlab.haskell.org/ghc/ghc/-/merge_requests/15740, krank:ignore-line
       # https://gitlab.haskell.org/ghc/ghc/-/issues/27033. krank:ignore-line
-      ++
-        lib.optionals
-          (
-            version == "9.12.3"
-            # TODO(@sternenseemann): 9.14.2 will likely also have this patch
-            || (lib.versionAtLeast version "9.14" && lib.versionOlder version "9.15.20260127")
-          )
-          [
-            (fetchpatch {
-              name = "ghc-9.12.3-ghcjs-install-rts-types.h.patch";
-              url = "https://gitlab.haskell.org/ghc/ghc/-/commit/5b1be555be4f0989d78c274991c5046d7ac6d25e.patch";
-              hash = "sha256-pv4NDyQ6FlZgmTYZ4Ghis4qggt7nCDMhqGaFxTxVPac=";
-              includes = [ "rts/rts.cabal" ];
-            })
-          ]
+      ++ lib.optionals (version == "9.12.3" || version == "9.14.1") [
+        (fetchpatch {
+          name = "ghc-9.12.3-ghcjs-install-rts-types.h.patch";
+          url = "https://gitlab.haskell.org/ghc/ghc/-/commit/5b1be555be4f0989d78c274991c5046d7ac6d25e.patch";
+          hash = "sha256-pv4NDyQ6FlZgmTYZ4Ghis4qggt7nCDMhqGaFxTxVPac=";
+          includes = [ "rts/rts.cabal" ];
+        })
+      ]
 
       ++ (import ./common-llvm-patches.nix { inherit lib version fetchpatch; });
 
@@ -855,16 +843,6 @@ stdenv.mkDerivation (
     preInstall = ''
       pushd _build/bindist/*
 
-    ''
-    # the bindist configure script uses different env variables than the GHC configure script
-    # see https://github.com/NixOS/nixpkgs/issues/267250 krank:ignore-line
-    # https://gitlab.haskell.org/ghc/ghc/-/issues/24211  krank:ignore-line
-    + lib.optionalString (stdenv.targetPlatform.linker == "cctools") ''
-      export InstallNameToolCmd=$INSTALL_NAME_TOOL
-      export OtoolCmd=$OTOOL
-    ''
-    # Replicate configurePhase
-    + ''
       $configureScript "''${configureFlags[@]}"
     '';
 

diff --git a/pkgs/development/compilers/ghc/head.nix b/pkgs/development/compilers/ghc/head.nix
@@ -1,5 +1,5 @@
 import ./common-hadrian.nix {
-  version = "9.15.20260322";
-  rev = "44f118f09dcde49f64d03e427312df4732f2d4a4";
-  sha256 = "sha256-xby7HKyK5P1Y5DjKbVe62piDCY4Ujb4pbv8AJ7sQ0HI=";
+  version = "10.1.20260810";
+  rev = "556db2f32f59ec2d3b1c225d24d677c60a695e3f";
+  sha256 = "sha256-lB4udTc9hQZEnldmvpllDkCtUVte65/ZMhZd7rf5xOY=";
 }
diff --git a/pkgs/development/haskell-modules/cabal2nix-unstable/cabal2nix.nix b/pkgs/development/haskell-modules/cabal2nix-unstable/cabal2nix.nix
@@ -35,10 +35,10 @@
 }:
 mkDerivation {
   pname = "cabal2nix";
-  version = "2.21.3-unstable-2026-03-30";
+  version = "2.21.3-unstable-2026-06-23";
   src = fetchzip {
-    url = "https://github.com/NixOS/cabal2nix/archive/41239bcc0622a0975c6705a03a44dfeffeb56f23.tar.gz";
-    sha256 = "01qj6cvaif0810v83r6izcj1bbfpcqqxw4wybq04qsq92sqybpw2";
+    url = "https://github.com/NixOS/cabal2nix/archive/bb97bf4294097812718ab9a3f244c9d58c833ae1.tar.gz";
+    sha256 = "0bp5m83hzcsr3ga9zz5kq1jjs0n44mlh93x5j55avgw1rxvpfw32";
   };
   postUnpack = "sourceRoot+=/cabal2nix; echo source root reset to $sourceRoot";
   isLibrary = true;
@@ -106,5 +106,5 @@ mkDerivation {
   '';
   homepage = "https://github.com/nixos/cabal2nix#readme";
   description = "Convert Cabal files into Nix build instructions";
-  license = lib.licensesSpdx."BSD-3-Clause";
+  license = lib.meta.getLicenseFromSpdxId "BSD-3-Clause";
 }
diff --git a/pkgs/development/haskell-modules/cabal2nix-unstable/distribution-nixpkgs.nix b/pkgs/development/haskell-modules/cabal2nix-unstable/distribution-nixpkgs.nix
@@ -18,10 +18,10 @@
 }:
 mkDerivation {
   pname = "distribution-nixpkgs";
-  version = "1.7.1.1-unstable-2026-03-30";
+  version = "1.7.1.1-unstable-2026-06-23";
   src = fetchzip {
-    url = "https://github.com/NixOS/cabal2nix/archive/41239bcc0622a0975c6705a03a44dfeffeb56f23.tar.gz";
-    sha256 = "01qj6cvaif0810v83r6izcj1bbfpcqqxw4wybq04qsq92sqybpw2";
+    url = "https://github.com/NixOS/cabal2nix/archive/bb97bf4294097812718ab9a3f244c9d58c833ae1.tar.gz";
+    sha256 = "0bp5m83hzcsr3ga9zz5kq1jjs0n44mlh93x5j55avgw1rxvpfw32";
   };
   postUnpack = "sourceRoot+=/distribution-nixpkgs; echo source root reset to $sourceRoot";
   enableSeparateDataOutput = true;
@@ -49,5 +49,5 @@ mkDerivation {
   ];
   homepage = "https://github.com/NixOS/cabal2nix/tree/master/distribution-nixpkgs#readme";
   description = "Types and functions to manipulate the Nixpkgs distribution";
-  license = lib.licensesSpdx."BSD-3-Clause";
+  license = lib.meta.getLicenseFromSpdxId "BSD-3-Clause";
 }
diff --git a/pkgs/development/haskell-modules/cabal2nix-unstable/hackage-db.nix b/pkgs/development/haskell-modules/cabal2nix-unstable/hackage-db.nix
@@ -16,10 +16,10 @@
 }:
 mkDerivation {
   pname = "hackage-db";
-  version = "2.1.3-unstable-2026-03-30";
+  version = "2.1.3-unstable-2026-06-23";
   src = fetchzip {
-    url = "https://github.com/NixOS/cabal2nix/archive/41239bcc0622a0975c6705a03a44dfeffeb56f23.tar.gz";
-    sha256 = "01qj6cvaif0810v83r6izcj1bbfpcqqxw4wybq04qsq92sqybpw2";
+    url = "https://github.com/NixOS/cabal2nix/archive/bb97bf4294097812718ab9a3f244c9d58c833ae1.tar.gz";
+    sha256 = "0bp5m83hzcsr3ga9zz5kq1jjs0n44mlh93x5j55avgw1rxvpfw32";
   };
   postUnpack = "sourceRoot+=/hackage-db; echo source root reset to $sourceRoot";
   isLibrary = true;
@@ -38,5 +38,5 @@ mkDerivation {
   ];
   homepage = "https://github.com/NixOS/cabal2nix/tree/master/hackage-db#readme";
   description = "Access cabal-install's Hackage database via Data.Map";
-  license = lib.licensesSpdx."BSD-3-Clause";
+  license = lib.meta.getLicenseFromSpdxId "BSD-3-Clause";
 }
diff --git a/pkgs/development/haskell-modules/cabal2nix-unstable/language-nix.nix b/pkgs/development/haskell-modules/cabal2nix-unstable/language-nix.nix
@@ -14,10 +14,10 @@
 }:
 mkDerivation {
   pname = "language-nix";
-  version = "2.3.0-unstable-2026-03-30";
+  version = "2.3.0-unstable-2026-06-23";
   src = fetchzip {
-    url = "https://github.com/NixOS/cabal2nix/archive/41239bcc0622a0975c6705a03a44dfeffeb56f23.tar.gz";
-    sha256 = "01qj6cvaif0810v83r6izcj1bbfpcqqxw4wybq04qsq92sqybpw2";
+    url = "https://github.com/NixOS/cabal2nix/archive/bb97bf4294097812718ab9a3f244c9d58c833ae1.tar.gz";
+    sha256 = "0bp5m83hzcsr3ga9zz5kq1jjs0n44mlh93x5j55avgw1rxvpfw32";
   };
   postUnpack = "sourceRoot+=/language-nix; echo source root reset to $sourceRoot";
   libraryHaskellDepends = [
@@ -39,5 +39,5 @@ mkDerivation {
   ];
   homepage = "https://github.com/NixOS/cabal2nix/tree/master/language-nix#readme";
   description = "Data types and functions to represent the Nix language";
-  license = lib.licensesSpdx."BSD-3-Clause";
+  license = lib.meta.getLicenseFromSpdxId "BSD-3-Clause";
 }