Add attoparsec-aeson to nix flake

flake.nix

@@ -9,6 +9,12 @@
       url = "github:edolstra/flake-compat";
       flake = false;
     };
+    # TODO: Package is not yet in 23.05 but it is in unstable. Once 23.11
+    #       Has been released remove this
+    attoparsec-aeson = {
+      url = "github:athanclark/aeson-attoparsec/v0.0.0";
+      flake = false;
+    };
 
     ghc-tcplugins-extra = {
       url = "github:clash-lang/ghc-tcplugins-extra";
@@ -51,6 +57,7 @@
           makeOverlay =
             import (./. + "/nix/overlay.nix") {
               inherit (args)
+                attoparsec-aeson
                 ghc-tcplugins-extra
                 ghc-typelits-extra
                 ghc-typelits-knownnat

nix/overlay.nix

@@ -6,7 +6,8 @@
 # packages to the environment, or need to change the configuration of the
 # different packages maintained by QBayLogic.
 
-{ ghc-tcplugins-extra
+{ attoparsec-aeson
+, ghc-tcplugins-extra
 , ghc-typelits-extra
 , ghc-typelits-knownnat
 , ghc-typelits-natnormalise
@@ -25,6 +26,13 @@ let
   # standalone repositories, e.g. the typechecker plugins needed for Clash.
   haskellExternalPackages =
     hfinal: hprev: {
+    # TODO: Package is not yet in 23.05 but it is in unstable. Once 23.11
+    #       Has been released remove this
+      attoparsec-aeson = hprev.callCabal2nix
+          "attoparsec-aeson"
+          "${attoparsec-aeson}"
+          { };
+
       ghc-tcplugins-extra =
         hprev.callCabal2nix
           "ghc-tcplugins-extra"