KillTheMule

Note that when you change num to take &self instead, this works out (you also need to mark foo as mutable, of course).

I’m sure everyone’s thought about it already but hasn’t done enough so far.

Note though that the rust foundation has established a security initiative (see e.g. here), which does include the supply chain via crates.io.

2 was good, thanks. 4 needs a tad more thought imho, returning an impl T does have its place, because it makes changing the return type of the function a non-breaking change.