temp

source/recipes/devshell/haskell-pkg/main.adoc0

@@ -28,6 +28,22 @@ Here's a short Haskell program that uses it.
 include::Main.hs[]
 ....
 
+REDO containers is there by default
+
+REDO containers is there by default
+
+REDO containers is there by default
+
+REDO containers is there by default
+
+REDO containers is there by default
+
+REDO containers is there by default
+
+REDO containers is there by default
+
+REDO containers is there by default
+
 Here's a demonstration using the program.
 
 ....

source/recipes/devshell/haskell-pkg/tempwork/Main.hs

@@ -0,0 +1,11 @@
+import Data.Map
+
+m :: Map String Int
+m = fromList [("cats", 3), ("dogs", 2)]
+
+main :: IO ()
+main = do
+  let cats = findWithDefault 0 "cats" m
+  let dogs = findWithDefault 0 "dogs" m
+  let zebras = findWithDefault 0 "zebras" m
+  print $ "I have " ++ show cats ++ " cats, " ++ show dogs ++ " dogs, and " ++ show zebras ++ " zebras."

source/recipes/devshell/haskell-pkg/tempwork/flake.lock

@@ -0,0 +1,60 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1757790242,
+        "narHash": "sha256-53ib4nvwVVAYF1ipe7BBEwjvvBo0lEbQcsbCHPSfzAg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "38cbd6b3be3ce84eb389eabb552dff8824019d2b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

source/recipes/devshell/haskell-pkg/tempwork/flake.nix

@@ -0,0 +1,21 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        customGhc = pkgs.haskellPackages.ghcWithPackages (p: with p; [ containers ]);
+      in
+      {
+        devShells = rec {
+          default = pkgs.mkShell {
+	          buildInputs = [ customGhc ];
+          };
+        };
+      }
+    );
+}