Use native JS backend

shell.nix

@@ -1,14 +1,14 @@
 # an ad-hoc nix setup, pending proper nixification of the build
 
-# roughly release-22.05
-with import (builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/d3551b986a714071360b75feffa0ce117417f09c.tar.gz) { };
+# nixpkgs master January 2023
+with import (builtins.fetchTarball https://github.com/NixOS/nixpkgs/archive/6ff46bd3309820a57817ff82ef0fc05526b5266f.tar.gz) { };
 with haskell.lib;
 mkShellNoCC rec {
   name = "incredible-proof-machine-env";
   buildInputs = [
     cabal-install
 
-    (haskell.packages.ghc8107.ghc.withPackages(p: with p; [
+    (haskell.packages.ghcHEAD.ghc.withPackages(p: with p; [
        aeson
        parsec
        tagged
@@ -24,34 +24,38 @@ mkShellNoCC rec {
        extra
       ]))
 
-    ((haskell.packages.ghcjs
+    (( pkgsCross.ghcjs.haskell.packages.ghcHEAD
       .override({ overrides = self: super: {
-        # depends on doctest
-        foldl = dontCheck super.foldl;
-        # fails
-        unbound-generics = dontCheck super.unbound-generics;
-        unliftio = dontCheck super.unliftio;
-        conduit = dontCheck super.conduit;
-        # slow
-        mono-traversable = dontCheck super.mono-traversable;
-        libyaml = dontCheck super.libyaml;
-        text-short = dontCheck super.text-short;
+      #   # depends on doctest
+      #   foldl = dontCheck super.foldl;
+      #   # fails
+      #   unbound-generics = dontCheck super.unbound-generics;
+      #   unliftio = dontCheck super.unliftio;
+      #   conduit = dontCheck super.conduit;
+      #   # slow
+      #   mono-traversable = dontCheck super.mono-traversable;
+      #   libyaml = dontCheck super.libyaml;
+      #   text-short = dontCheck super.text-short;
 
 
-        # Can be dropped when nixpkgs includes
-        # https://github.com/NixOS/nixpkgs/pull/177489/files
-        # Keep synced with kaleidogen for better cache usage!
-        ghcjs-base = super.ghcjs-base.overrideAttrs(d: {
-          src = pkgs.fetchFromGitHub {
-            owner = "ghcjs";
-            repo = "ghcjs-base";
-            rev = "fbaae59b05b020e91783df122249095e168df53f";
-            sha256 = "sha256-x6eCAK1Hne0QkV3Loi9YpxbleNHU593E4AO8cbk2vUc=";
-          };
-        });
+      #   # Can be dropped when nixpkgs includes
+      #   # https://github.com/NixOS/nixpkgs/pull/177489/files
+      #   # Keep synced with kaleidogen for better cache usage!
+      #   ghcjs-base = super.ghcjs-base.overrideAttrs(d: {
+      #     src = pkgs.fetchFromGitHub {
+      #       owner = "ghcjs";
+      #       repo = "ghcjs-base";
+      #       rev = "fbaae59b05b020e91783df122249095e168df53f";
+      #       sha256 = "sha256-x6eCAK1Hne0QkV3Loi9YpxbleNHU593E4AO8cbk2vUc=";
+      #     };
+      #   });
 
-      };}))
-      .ghc.withPackages(p: with p; [
+       # new base dependency
+       indexed-traversable = doJailbreak super.indexed-traversable;
+       OneTuple = doJailbreak super.OneTuple;
+       hashable = doJailbreak super.hashable;
+     };})
+    ).ghc.withPackages(p: with p; [
        aeson
        parsec
        tagged