stack: switch to building with ghc8107

stack-2.7.3 currently only supports being built with ghc8107, not
ghc902.

pkgs/development/haskell-modules/configuration-common.nix

@@ -985,7 +985,18 @@ self: super: {
    optparse-applicative = self.optparse-applicative_0_15_1_0;
   }));
   ormolu = generateOptparseApplicativeCompletion "ormolu" super.ormolu;
-  stack = generateOptparseApplicativeCompletion "stack" super.stack;
+
+  # Currently only builds with GHC-8.10.7 and old aeson:
+  # https://github.com/commercialhaskell/stack/issues/5670
+  # https://github.com/commercialhaskell/stack/issues/5558
+  stack =
+    generateOptparseApplicativeCompletion "stack"
+      (super.stack.overrideScope (self: super: {
+        # pantry-0.5.2.1 requires aeson < 2.
+        aeson = self.aeson_1_5_6_0;
+        # stack-2.7.3 requires old version of pantry.
+        pantry = self.pantry_0_5_2_1;
+      }));
 
   # Too strict version bound on hashable-time.
   # Tests require newer package version.

pkgs/top-level/all-packages.nix

@@ -12427,7 +12427,11 @@ with pkgs;
 
   cabal-install = haskell.lib.compose.justStaticExecutables haskellPackages.cabal-install;
 
-  stack = haskell.lib.compose.justStaticExecutables haskellPackages.stack;
+  # stack doesn't build with ghc902 (Cabal-3.4) yet:
+  # https://github.com/commercialhaskell/stack/issues/5670
+  # https://github.com/commercialhaskell/stack/issues/5558
+  stack = haskell.lib.compose.justStaticExecutables haskell.packages.ghc8107.stack;
+
   hlint = haskell.lib.compose.justStaticExecutables haskellPackages.hlint;
 
   krank = haskell.lib.compose.justStaticExecutables haskellPackages.krank;