Update to stack LTS 20.12

.github/workflows/test.yml

@@ -128,8 +128,7 @@ jobs:
           export DEBIAN_FRONTEND=noninteractive
           apt-get update
           apt-get install -qy bzip2 curl haskell-stack make procps zlib1g-dev
-      - name: "Upgrade stack on old distributions"
-        if: ${{ (matrix.os == 'ubuntu') && (matrix.version == '20.04') }}
+      - name: "Upgrade stack to work with GHC 9.2"
         run: |
           stack upgrade
           echo "PATH=~/.local/bin:$PATH" >> $GITHUB_ENV

compiler/stack.yaml

@@ -4,7 +4,7 @@
 
 # NOTE: do not forget to update homebrew/Formula/acton.rb with the version of
 # GHC that corresponds to the stack LTS release, like lts-18.28 -> [email protected]
-resolver: lts-18.28
+resolver: lts-20.11
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.

compiler/stack.yaml.lock

@@ -13,7 +13,7 @@ packages:
     hackage: dir-traverse-0.2.3.0
 snapshots:
 - completed:
-    sha256: 428ec8d5ce932190d3cbe266b9eb3c175cd81e984babf876b64019e2cbe4ea68
-    size: 590100
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/18/28.yaml
-  original: lts-18.28
+    sha256: adbc602422dde10cc330175da7de8609e70afc41449a7e2d6e8b1827aa0e5008
+    size: 649342
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/20/11.yaml
+  original: lts-20.11

homebrew/Formula/acton.rb

@@ -9,7 +9,7 @@ class Acton < Formula
   # TODO: can gettext be removed? it was likely necessary when we built deps
   # using autoconf, but might not be needed now that we use build.zig?
   depends_on "gettext" => :build
-  depends_on "ghc@8.10" => :build
+  depends_on "ghc@9.2" => :build
   depends_on "haskell-stack" => :build
 
   on_linux do