rnix-lsp with rnix-parser patched for memory leak bug

cargo.patch

diff --git a/Cargo.lock b/Cargo.lock
index 05ad0a9..1b77af8 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1,5 +1,7 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
+version = 3
+
 [[package]]
 name = "aho-corasick"
 version = "0.7.18"
@@ -420,8 +422,7 @@ checksum = "f497285884f3fcff424ffc933e56d7cbca511def0c9831a7f9b5f6153e3cc89b"
 [[package]]
 name = "rnix"
 version = "0.9.0"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b37f8af07a0354606141df076458660af7e22238e4117a041c21c548080addd"
+source = "git+https://github.com/nix-community/rnix-parser?branch=fix-memleak#0f383bef353a639be97d2ab56f91eb07f2ad0c7e"
 dependencies = [
  "cbitset",
  "rowan",
diff --git a/Cargo.toml b/Cargo.toml
index 258c9e9..b3e978b 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -24,3 +24,6 @@ rnix = "0.9.0"
 rowan = "0.12.6"
 serde = "1.0.104"
 serde_json = "1.0.44"
+
+[patch.crates-io]
+rnix = { git = "https://github.com/nix-community/rnix-parser", branch = "fix-memleak" }

flake.lock

{
  "nodes": {
    "nixpkgs": {
      "locked": {
        "lastModified": 1630481079,
        "narHash": "sha256-leWXLchbAbqOlLT6tju631G40SzQWPqaAXQG3zH1Imw=",
        "owner": "nixos",
        "repo": "nixpkgs",
        "rev": "110a2c9ebbf5d4a94486854f18a37a938cfacbbb",
        "type": "github"
      },
      "original": {
        "owner": "nixos",
        "ref": "nixos-21.05",
        "repo": "nixpkgs",
        "type": "github"
      }
    },
    "root": {
      "inputs": {
        "nixpkgs": "nixpkgs",
        "utils": "utils"
      }
    },
    "utils": {
      "locked": {
        "lastModified": 1629481132,
        "narHash": "sha256-JHgasjPR0/J1J3DRm4KxM4zTyAj4IOJY8vIl75v/kPI=",
        "owner": "numtide",
        "repo": "flake-utils",
        "rev": "997f7efcb746a9c140ce1f13c72263189225f482",
        "type": "github"
      },
      "original": {
        "owner": "numtide",
        "repo": "flake-utils",
        "type": "github"
      }
    }
  },
  "root": "root",
  "version": 7
}

flake.nix

{
  inputs = {
    utils.url = "github:numtide/flake-utils";
    nixpkgs.url = "github:nixos/nixpkgs/nixos-21.05";
  };

  outputs = { self, nixpkgs, utils }:
    utils.lib.eachDefaultSystem (system:
      let
        pkgs = nixpkgs.legacyPackages."${system}";
      in {
        defaultPackage = pkgs.rustPlatform.buildRustPackage {
          name = "rnix-lsp";
          src = pkgs.fetchFromGitHub {
              owner = "nix-community";
              repo = "rnix-lsp";
              rev = "ab9c26a903846fc6712b811bdb32a2539ed3a42d";
              hash = "sha256-hlJ0FYaxUGpFqAuhB+Fde7ydxJQXV3NIwKQ8rW85gc8=";
          };
          cargoPatches = [ ./cargo.patch ];
          checkInputs = [ pkgs.nixUnstable ];
          cargoSha256 = "sha256-4vVVPOJaTZF1xsHNDkK9UFofqUjJqahkesqikWLYYlk=";
        };
      });
}