Start trying to make use of `Root` and `Scan` traits.
Start trying to make use of `Root` and `Scan` traits.

Note that one needs to start with a rust sometime at or after
commit cb58a9d3a4ddd24ab7ced41eba55390f8b6815e9

pnkfelix/stackscan-demo,pnkfelix/stackscan-demo