Nginx别名与laravel4

laravel的我的nginx配置

 server {
        listen          80;
        server_name     app.dev;
        rewrite_log     on;
        root            /var/www/l4/angular;
        index         index.html;

        location /{
        # URLs to attempt, including pretty ones.
            try_files   $uri $uri/ /index.php?$query_string;

        }
        location /lara/ {
          index index.php;
          alias /var/www/l4/public/;
        }
        # Remove trailing slash to please routing system.
        if (!-d $request_filename) {
            rewrite     ^/(.+)/$ /$1 permanent;
        }
        location ~ ^/lara/(.*\.php)$ {
              alias /var/www/l4/public/$1;
                      fastcgi_pass unix:/var/run/php5-fpm.sock;
                      fastcgi_index index.php;
                      fastcgi_param SCRIPT_FILENAME    $document_root$fastcgi_script_name;
                      include fastcgi_params;
        }
    }

Laravel路线:

Route::get('/', function()
{
    return View::make('index');
});

Route::get('x', function()
{
    return "alpha";
});

我的问题是," http://app.dev/lara/index.php "正在运行,但" http://app.dev/lara "和lara/x无效.