Drop GHC 9.4 and lower

Author: andreasabel

.github/workflows/haskell-ci.yml

@@ -52,31 +52,6 @@ jobs:
             compilerVersion: 9.6.7
             setup-method: ghcup
             allow-failure: false
-          - compiler: ghc-9.4.8
-            compilerKind: ghc
-            compilerVersion: 9.4.8
-            setup-method: ghcup
-            allow-failure: false
-          - compiler: ghc-9.2.8
-            compilerKind: ghc
-            compilerVersion: 9.2.8
-            setup-method: ghcup
-            allow-failure: false
-          - compiler: ghc-9.0.2
-            compilerKind: ghc
-            compilerVersion: 9.0.2
-            setup-method: ghcup
-            allow-failure: false
-          - compiler: ghc-8.10.7
-            compilerKind: ghc
-            compilerVersion: 8.10.7
-            setup-method: ghcup
-            allow-failure: false
-          - compiler: ghc-8.8.4
-            compilerKind: ghc
-            compilerVersion: 8.8.4
-            setup-method: ghcup
-            allow-failure: false
       fail-fast: false
     steps:
       - name: apt-get install
@@ -196,7 +171,7 @@ jobs:
           echo "    ghc-options: -Werror=missing-methods" >> cabal.project
           cat >> cabal.project <<EOF
           EOF
-          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: any.$_ installed\n" unless /^(Cabal|Cabal-syntax|hackage-server|parsec|process|text|transformers)$/; }' >> cabal.project.local
+          $HCPKG list --simple-output --names-only | perl -ne 'for (split /\s+/) { print "constraints: any.$_ installed\n" unless /^(Cabal|Cabal-syntax|hackage-server|parsec|process|text)$/; }' >> cabal.project.local
           cat cabal.project
           cat cabal.project.local
       - name: dump install plan

cabal.haskell-ci

@@ -1,13 +1,13 @@
 branches: master
 
-installed: +all -Cabal -Cabal-syntax -text -parsec -process -transformers
+installed: +all -Cabal -Cabal-syntax -text -parsec -process
 
 -- Does not work with GHA:
 -- -- allow failures with ghc-7.6 and ghc-7.8
 -- allow-failures: <7.9
 
--- Use Ubuntu 22.04
-distribution: jammy
+-- -- Use Ubuntu 22.04
+-- distribution: jammy
 
 apt: libbrotli-dev libgd-dev
   -- libgd-dev is for gd via hs-captcha

hackage-server.cabal

@@ -32,11 +32,7 @@ tested-with:
   GHC == 9.10.2
   GHC == 9.8.4
   GHC == 9.6.7
-  GHC == 9.4.8
-  GHC == 9.2.8
-  GHC == 9.0.2
-  GHC == 8.10.7
-  GHC == 8.8.4
+  -- Constraint transformers >= 0.6 forces GHC >= 9.6 for CI
 
 data-dir: datafiles
 data-files:
@@ -131,7 +127,7 @@ common defaults
   -- see `cabal.project.local-ghc-${VERSION}` files
   build-depends:
     , array                  >= 0.5   && < 0.6
-    , base                   >= 4.13  && < 4.22
+    , base                   >= 4.18  && < 4.22
     , binary                 >= 0.8   && < 0.9
     , bytestring             >= 0.10  && < 0.13
     , containers             >= 0.6.0 && < 0.9