splitted parser and grammar into two separate .a

flake.nix

@@ -4,17 +4,22 @@
   inputs.flake-utils.url = "github:numtide/flake-utils";
   inputs.generic_c.url = "github:Maix0/generic_c";
   inputs.c_formatter_42.url = "github:Maix0/c_formatter_42-flake";
+  inputs.rust-overlay.url = "github:oxalica/rust-overlay";
 
   outputs = {
     self,
     nixpkgs,
     flake-utils,
     generic_c,
-    c_formatter_42
+    c_formatter_42,
+    rust-overlay,
   }:
     flake-utils.lib.eachDefaultSystem (
       system: let
-        pkgs = nixpkgs.legacyPackages.${system};
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [(import rust-overlay)];
+        };
       in {
         devShell = pkgs.mkShell {
           packages = with pkgs; [
@@ -28,6 +33,7 @@
             c_formatter_42.packages.${system}.default
             llvmPackages.bintools
             norminette
+            rust-bin.stable.latest.default
           ];
           VALGRIND_INC_OPT = "${pkgs.valgrind.dev}/include";
           ASAN_OPTIONS = "strict_string_checks=1:detect_stack_use_after_return=1:check_initialization_order=1:strict_init_order=1";