spago: set earlier dhall dependency

pkgs/development/haskell-modules/configuration-hackage2nix/main.yaml

@@ -105,6 +105,7 @@ extra-packages:
   - dependent-map == 0.2.4.0            # required by Hasura 1.3.1, 2020-08-20
   - dependent-sum == 0.4                # required by Hasura 1.3.1, 2020-08-20
   - dhall == 1.29.0                     # required for ats-pkg
+  - dhall == 1.38.1                     # required for spago
   - Diff < 0.4                          # required by liquidhaskell-0.8.10.2: https://github.com/ucsd-progsys/liquidhaskell/issues/1729
   - ghc-tcplugins-extra ==0.3.2         # required for polysemy-plugin 0.2.5.0
   - haddock == 2.23.*                   # required on GHC < 8.10.x

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

@@ -577,7 +577,12 @@ self: super: builtins.intersectAttrs super {
         sha256 = "1hjdprm990vyxz86fgq14ajn0lkams7i00h8k2i2g1a0hjdwppq6";
       };
 
-      spagoDocs = overrideCabal super.spago (drv: {
+      spagoWithOverrides = super.spago.override {
+        # spago has not yet been updated for the latest dhall.
+        dhall = self.dhall_1_38_1;
+      };
+
+      spagoDocs = overrideCabal spagoWithOverrides (drv: {
         postUnpack = (drv.postUnpack or "") + ''
           # Spago includes the following two files directly into the binary
           # with Template Haskell.  They are fetched at build-time from the

pkgs/development/haskell-modules/hackage-packages.nix

@@ -73601,6 +73601,64 @@ self: {
        maintainers = with lib.maintainers; [ Gabriel439 ];
      }) {};
 
+  "dhall_1_38_1" = callPackage
+    ({ mkDerivation, aeson, aeson-pretty, ansi-terminal, atomic-write
+     , base, bytestring, case-insensitive, cborg, cborg-json, containers
+     , contravariant, cryptonite, data-fix, deepseq, Diff, directory
+     , doctest, dotgen, either, exceptions, filepath, foldl, gauge
+     , generic-random, half, hashable, haskeline, http-client
+     , http-client-tls, http-types, lens-family-core, megaparsec, memory
+     , mmorph, mockery, mtl, network-uri, optparse-applicative
+     , parser-combinators, parsers, pretty-simple, prettyprinter
+     , prettyprinter-ansi-terminal, profunctors, QuickCheck
+     , quickcheck-instances, repline, scientific, serialise
+     , special-values, spoon, tasty, tasty-expected-failure, tasty-hunit
+     , tasty-quickcheck, tasty-silver, template-haskell, text
+     , text-manipulate, th-lift-instances, transformers
+     , transformers-compat, turtle, unordered-containers, uri-encode
+     , vector
+     }:
+     mkDerivation {
+       pname = "dhall";
+       version = "1.38.1";
+       sha256 = "0g70x2crdrkwf41gvwr718am25dmbn9bg4cml9f9va7i1vx5rsgk";
+       revision = "2";
+       editedCabalFile = "02z0jmzzp20yj46iz6i384xwc6k2anxb33smvc4yhpmhqjs0aq8a";
+       isLibrary = true;
+       isExecutable = true;
+       enableSeparateDataOutput = true;
+       libraryHaskellDepends = [
+         aeson aeson-pretty ansi-terminal atomic-write base bytestring
+         case-insensitive cborg cborg-json containers contravariant
+         cryptonite data-fix deepseq Diff directory dotgen either exceptions
+         filepath half hashable haskeline http-client http-client-tls
+         http-types lens-family-core megaparsec memory mmorph mtl
+         network-uri optparse-applicative parser-combinators parsers
+         pretty-simple prettyprinter prettyprinter-ansi-terminal profunctors
+         repline scientific serialise template-haskell text text-manipulate
+         th-lift-instances transformers transformers-compat
+         unordered-containers uri-encode vector
+       ];
+       executableHaskellDepends = [ base ];
+       testHaskellDepends = [
+         base bytestring cborg containers data-fix deepseq directory doctest
+         either filepath foldl generic-random http-client http-client-tls
+         lens-family-core megaparsec mockery prettyprinter QuickCheck
+         quickcheck-instances scientific serialise special-values spoon
+         tasty tasty-expected-failure tasty-hunit tasty-quickcheck
+         tasty-silver template-haskell text transformers turtle
+         unordered-containers vector
+       ];
+       benchmarkHaskellDepends = [
+         base bytestring containers directory gauge text
+       ];
+       doCheck = false;
+       description = "A configuration language guaranteed to terminate";
+       license = lib.licenses.bsd3;
+       hydraPlatforms = lib.platforms.none;
+       maintainers = with lib.maintainers; [ Gabriel439 ];
+     }) {};
+
   "dhall" = callPackage
     ({ mkDerivation, aeson, aeson-pretty, ansi-terminal, atomic-write
      , base, bytestring, case-insensitive, cborg, cborg-json, containers