Laravel 5 Controller using variable arguments

I have a controller in Laravel 5.

I would like to write a controller function that accepts variable arguments.

For example,

public function show(Request $request, ...$id)
{
    // handle multiple $id values here
}

The reason is that I have a url structure that has 'nested' models. For instance:

\item\{$id}
\parent\{$parent_id}\item\{$id}
\grandparent\{$grandparent_id}\parent\{$parent_id}\item\{$id}

My desire is to write a single show() method. Because of the structure of my database, it is possible. But the UrlGenerator keeps throwing a UrlGenerationException when I try to use variable arguments. It seems like it doesn't understand this construct?

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