From afed9dbda55b776a60cb576062828376ade55246 Mon Sep 17 00:00:00 2001
From: Andreas Abel <andreas.abel@ifi.lmu.de>
Date: Mon, 12 Jan 2026 08:15:02 +0100
Subject: [PATCH 1/2] Bump cabal-version to 1.18

---
 happy.cabal | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/happy.cabal b/happy.cabal
index ae9cef27..42a77935 100644
--- a/happy.cabal
+++ b/happy.cabal
@@ -1,3 +1,4 @@
+cabal-version: 1.18
 name: happy
 version: 2.1.7
 license: BSD2
@@ -10,7 +11,6 @@ stability: stable
 homepage: https://www.haskell.org/happy/
 synopsis: Happy is a parser generator for Haskell
 category: Development
-cabal-version: >= 1.10
 build-type: Simple
 
 Description:
@@ -34,10 +34,12 @@ tested-with:
         GHC == 8.2.2
         GHC == 8.0.2
 
-extra-source-files:
+extra-doc-files:
         ChangeLog.md
-        Makefile
         README.md
+
+extra-source-files:
+        Makefile
         examples/glr/nlp/Main.lhs
         examples/glr/nlp/Makefile
         examples/glr/nlp/README

From a0d35468a1b933c3de0fad6392138f341ef797b5 Mon Sep 17 00:00:00 2001
From: Andreas Abel <andreas.abel@ifi.lmu.de>
Date: Mon, 12 Jan 2026 08:16:43 +0100
Subject: [PATCH 2/2] Remove unused packages from happy executable

---
 .github/workflows/haskell-ci.yml | 4 ++++
 cabal.haskell-ci                 | 2 +-
 happy.cabal                      | 3 ---
 3 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/haskell-ci.yml b/.github/workflows/haskell-ci.yml
index 51b85bf2..34d105b0 100644
--- a/.github/workflows/haskell-ci.yml
+++ b/.github/workflows/haskell-ci.yml
@@ -227,6 +227,10 @@ jobs:
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods -Werror=missing-fields" >> cabal.project ; fi
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "package happy" >> cabal.project ; fi
           if [ $((HCNUMVER >= 80200)) -ne 0 ] ; then echo "    ghc-options: -Werror=missing-methods -Werror=missing-fields" >> cabal.project ; fi
+          if [ $((HCNUMVER >= 90000)) -ne 0 ] ; then echo "package happy-lib" >> cabal.project ; fi
+          if [ $((HCNUMVER >= 90000)) -ne 0 ] ; then echo "    ghc-options: -Werror=unused-packages" >> cabal.project ; fi
+          if [ $((HCNUMVER >= 90000)) -ne 0 ] ; then echo "package happy" >> cabal.project ; fi
+          if [ $((HCNUMVER >= 90000)) -ne 0 ] ; then echo "    ghc-options: -Werror=unused-packages" >> cabal.project ; fi
           cat >> cabal.project <<EOF
           EOF
           $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: any.$_ installed\n" unless /^(happy|happy-lib|mtl|transformers)$/; }' >> cabal.project.local
diff --git a/cabal.haskell-ci b/cabal.haskell-ci
index 40d844cb..b87d9fd0 100644
--- a/cabal.haskell-ci
+++ b/cabal.haskell-ci
@@ -1,6 +1,6 @@
 branches: master
 error-incomplete-patterns: False
-error-unused-packages: False
+error-unused-packages: >=9
 
 -- Specify 'constraint: ... installed' packages
 installed: +all -transformers -mtl
diff --git a/happy.cabal b/happy.cabal
index 42a77935..c94b18e5 100644
--- a/happy.cabal
+++ b/happy.cabal
@@ -141,9 +141,6 @@ executable happy
   main-is: Main.lhs
 
   build-depends: base >= 4.9 && < 5,
-                 array,
-                 containers >= 0.4.2,
-                 mtl >= 2.2.1,
                  happy-lib == 2.1.7
 
   default-language: Haskell98