add patch

flake.nix

@@ -0,0 +1,47 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-utils,
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = (import nixpkgs) {
+          inherit system;
+        };
+      in
+      rec {
+        packages = {
+          python = pkgs.python315.overrideAttrs (
+            finalAttrs: previousAttrs: {
+              patches = previousAttrs.patches ++ [
+                ./0001-add-to-parser.patch
+              ];
+              nativeBuildInputs = previousAttrs.nativeBuildInputs ++ [
+                pkgs.python3
+              ];
+              postConfigure = ''
+                ${previousAttrs.postConfigure or ""}
+                make regen-pegen
+                make regen-token
+              '';
+            }
+          );
+        };
+        devShells.default =
+          with pkgs;
+          mkShell {
+            buildInputs = [ ];
+            packages = [
+              packages.python
+            ];
+          };
+      }
+    );
+}