use neovim nightly

flake.lock

@@ -1,5 +1,36 @@
 {
   "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1606424373,
+        "narHash": "sha256-oq8d4//CJOrVj+EcOaSXvMebvuTkmBJuT5tzlfewUnQ=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "99f1c2157fba4bfe6211a321fd0ee43199025dbf",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1610051610,
+        "narHash": "sha256-U9rPz/usA1/Aohhk7Cmc2gBrEEKRzcW4nwPWMPwja4Y=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "3982c9903e93927c2164caa727cd3f6a0e6d14cc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
     "home-manager": {
       "inputs": {
         "nixpkgs": [
@@ -20,6 +51,51 @@
         "type": "github"
       }
     },
+    "neovim-flake": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "dir": "contrib",
+        "lastModified": 1625382879,
+        "narHash": "sha256-pi9EfFYaAdzCJuar24CT+nhkS29FCg2nufai1Qb0mZA=",
+        "owner": "neovim",
+        "repo": "neovim",
+        "rev": "490615612ed5ec587c8023de28db495b3181de30",
+        "type": "github"
+      },
+      "original": {
+        "dir": "contrib",
+        "owner": "neovim",
+        "repo": "neovim",
+        "type": "github"
+      }
+    },
+    "neovim-nightly": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "neovim-flake": "neovim-flake",
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1625386273,
+        "narHash": "sha256-72a9jmmR5LDU68jiDzQuwme8DuwGgbfCoco0wIjzCq4=",
+        "owner": "nix-community",
+        "repo": "neovim-nightly-overlay",
+        "rev": "85ac1e60a0d8ec5bff474219bf64f2c4b320f9c1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "neovim-nightly-overlay",
+        "type": "github"
+      }
+    },
     "nixpkgs": {
       "locked": {
         "lastModified": 1625281901,
@@ -39,6 +115,7 @@
     "root": {
       "inputs": {
         "home-manager": "home-manager",
+        "neovim-nightly": "neovim-nightly",
         "nixpkgs": "nixpkgs",
         "secrets": "secrets"
       }

flake.nix

@@ -2,9 +2,11 @@
   inputs = {
     nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
     home-manager.url = "github:nix-community/home-manager";
+    neovim-nightly.url = "github:nix-community/neovim-nightly-overlay";
     secrets.url = "github:LavaDesu/flakes-secrets";
 
     home-manager.inputs.nixpkgs.follows = "nixpkgs";
+    neovim-nightly.inputs.nixpkgs.follows = "nixpkgs";
   };
 
   outputs = inputs: with inputs;
@@ -27,7 +29,8 @@
           (path: nixpkgs.lib.hasSuffix ".nix" path) # Checks file extension
           (getPaths ./overlays)
         )
-      ) ++ [(self: super: customPackages super)];
+      ) ++ [(self: super: customPackages super)]
+        ++ [inputs.neovim-nightly.overlay];
 
       revCount = "299942";
       base = { config, ... }: {

users/rin/neovim.nix

@@ -15,6 +15,7 @@ in {
     viAlias = true;
     vimAlias = true;
     vimdiffAlias = true;
+    package = pkgs.neovim-nightly;
 
     plugins = with pkgs.vimPlugins; [
       coc-nvim