Add shell.nix

nixpkgs/23.11/default.nix

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+# DO NOT HAND-EDIT THIS FILE
+import (import ./thunk.nix)

nixpkgs/23.11/github.json

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+{
+  "owner": "nixos",
+  "repo": "nixpkgs",
+  "branch": "nixos-23.11",
+  "private": false,
+  "rev": "9d29cd266cebf80234c98dd0b87256b6be0af44e",
+  "sha256": "0bkrjx4x6sy4g9kmcddhlwrl4cpm4yvj7cljd7b8crf7kxpvaaf6"
+}

nixpkgs/23.11/thunk.nix

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+# DO NOT HAND-EDIT THIS FILE
+let fetch = { private ? false, fetchSubmodules ? false, owner, repo, rev, sha256, ... }:
+  if !fetchSubmodules && !private then builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz"; inherit sha256;
+  } else (import (builtins.fetchTarball {
+  url = "https://github.com/NixOS/nixpkgs/archive/3aad50c30c826430b0270fcf8264c8c41b005403.tar.gz";
+  sha256 = "0xwqsf08sywd23x0xvw4c4ghq0l28w2ki22h0bdn766i16z9q2gr";
+}) {}).fetchFromGitHub {
+    inherit owner repo rev sha256 fetchSubmodules private;
+  };
+  json = builtins.fromJSON (builtins.readFile ./github.json);
+in fetch json

nixpkgs/unstable/default.nix

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+# DO NOT HAND-EDIT THIS FILE
+import (import ./thunk.nix)

nixpkgs/unstable/github.json

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+{
+  "owner": "nixos",
+  "repo": "nixpkgs",
+  "branch": "nixpkgs-unstable",
+  "private": false,
+  "rev": "e2dd4e18cc1c7314e24154331bae07df76eb582f",
+  "sha256": "19zbxf7rb787jvyrfhl4z9sn3aisd6xvx6ikybbi75ym9sy39jds"
+}

nixpkgs/unstable/thunk.nix

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+# DO NOT HAND-EDIT THIS FILE
+let fetch = { private ? false, fetchSubmodules ? false, owner, repo, rev, sha256, ... }:
+  if !fetchSubmodules && !private then builtins.fetchTarball {
+    url = "https://github.com/${owner}/${repo}/archive/${rev}.tar.gz"; inherit sha256;
+  } else (import (builtins.fetchTarball {
+  url = "https://github.com/NixOS/nixpkgs/archive/3aad50c30c826430b0270fcf8264c8c41b005403.tar.gz";
+  sha256 = "0xwqsf08sywd23x0xvw4c4ghq0l28w2ki22h0bdn766i16z9q2gr";
+}) {}).fetchFromGitHub {
+    inherit owner repo rev sha256 fetchSubmodules private;
+  };
+  json = builtins.fromJSON (builtins.readFile ./github.json);
+in fetch json

release.nix

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+let pkgs = import ./nixpkgs/23.11 {};
+    ghcs = {
+      "ghc8107" = pkgs.haskell.packages.ghc8107;
+      "ghc902" = pkgs.haskell.packages.ghc902;
+      "ghc928" = pkgs.haskell.packages.ghc928;
+      "ghc948" = pkgs.haskell.packages.ghc948;
+      "ghc963" = pkgs.haskell.packages.ghc963;
+      "ghc981" = (import ./nixpkgs/unstable {}).haskell.packages.ghc981;
+    };
+in
+  pkgs.lib.mapAttrs (_: ghc: ghc.callCabal2nix "monoidal-containers" (builtins.fetchGit ./.) {}) ghcs

shell.nix

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+{ ghc ? "ghc981" # see release.nix for options
+}:
+(import ./release.nix).${ghc}.env