neovim wrapper: throw if two versions of nvim-treesitter are present

Author: PerchunPak

pkgs/applications/editors/vim/plugins/utils/vim-utils.nix

@@ -216,6 +216,14 @@ let
             ln -s ${python3Env}/${python3Env.sitePackages} $out/pack/${packageName}/start/__python3_dependencies/python3
           '';
         in
+
+        assert
+          (
+            builtins.elem vimPlugins.nvim-treesitter (opt ++ allPlugins)
+            && builtins.elem vimPlugins.nvim-treesitter-legacy (opt ++ allPlugins)
+          )
+          -> throw "You cannot include two different versions of nvim-treesitter, perhaps you included a legacy plugin together with a new one?";
+
         [
           packdirStart
           packdirOpt