By Nathan: the system nixpkgs is so old that making the tachikoma flake follow it changes the cargo dependency hash, so we now let it use its own modern nixpkgs

flake.lock

@@ -71,6 +71,21 @@
         "type": "indirect"
       }
     },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1781886833,
+        "narHash": "sha256-bqeNx2NLhy7WgrnYelivWIzwJgO3P1mmo5e0BXsxhJg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "7bed2d2f31c2681e30c36b1975c3706fb41f885b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs_stable": {
       "locked": {
         "lastModified": 1688392541,
@@ -128,9 +143,7 @@
     "tachikoma": {
       "inputs": {
         "flake-utils": "flake-utils_2",
-        "nixpkgs": [
+        "nixpkgs": "nixpkgs_2"
-          "nixpkgs"
-        ]
       },
       "locked": {
         "lastModified": 1781884897,

flake.nix

@@ -10,7 +10,8 @@
         };
         tachikoma = {
           url = "git+https://forge.room409.xyz/miloignis/tachikoma.git";
-          inputs.nixpkgs.follows =  "nixpkgs";
+          #inputs.nixpkgs.follows =  "nixpkgs";
+          #don't follow because it can change the cargo hash?
         };