Uninstall a port and ONLY THAT PORT's dependencies?

[db]

On 3 Oct 2017, at 04:20, "Daniel J. Luke" <dluke at geeklair.net> wrote:
> On Oct 2, 2017, at 6:47 PM, Dave Horsfall <dave at horsfall.org> wrote:
>> In other words, I appear to have stumbled across an obscure MacPorts bug, yet not having enough information on hand to be able to report it properly; I merely pointed out that your claim is demonstrably incorrect.
> I suspect that in your case you simply have ports installed from before the 'requested' flag was tracked by MacPorts (that's certainly behavior I've seen and is the main reason why I haven't personally used the 'requested' flag for anything).

This may be obvious, but I rather ask. Is a leaf left from uninstalled port A marked as a dependency during installation of port B if this needs it?