update flake

.gitignore

@@ -1,4 +1,5 @@
 Cargo.lock
 target/
 .envrc
-.direnv/
+.direnv/
+firedbg

flake.nix

@@ -1,20 +1,38 @@
 {
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-    rust-overlay.url = "github:oxalica/rust-overlay";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        flake-utils.follows = "flake-utils";
+      };
+    };
   };
-  outputs = { self, nixpkgs, rust-overlay, flake-utils, ... }:
-    flake-utils.lib.eachDefaultSystem (system:
-      let
-        overlays = [ (import rust-overlay) ];
-        pkgs = import nixpkgs { inherit system overlays; };
-        rustStable = pkgs.rust-bin.stable.latest.minimal.override {
-          extensions = [ "rust-src" "clippy" "rustfmt" ];
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    rust-overlay,
+  }:
+    flake-utils.lib.eachDefaultSystem
+    (
+      system: let
+        overlays = [(import rust-overlay)];
+        pkgs = import nixpkgs {
+          inherit system overlays;
         };
-      in with pkgs; {
-        devShell = mkShell {
-          buildInputs = [ openssl pkg-config rustStable cargo-release ];
+        rustToolchain = pkgs.pkgsBuildHost.rust-bin.nightly.latest.default.override {
+          extensions = ["rust-src" "rust-analyzer" "rustc-codegen-cranelift-preview"];
         };
-      });
+      in
+        with pkgs; {
+          devShells.default = mkShell {
+            nativeBuildInputs = with pkgs; [rustToolchain pkg-config];
+            buildInputs = with pkgs; [openssl clang cargo-release];
+            RUST_BACKTRACE = "1";
+          };
+        }
+    );
 }