Wrapping structs with common type and methods

[xandox]

Hello.
I have a question.
I have one crate with something like:

pub struct A {
// ...
}

pub struct B {
   a: A
}

pub struct C {
   a: A
}

impl A {
// ...
}

impl B {
// ...
}

impl C {
// ...
}

// and impl Deref, DerefMut for B and C with Target=A

In other crate I would wrap it in python classes.
And question is how to make this subclassing?
In subclassing examples structs do not share a data.
Right now I duplicate methods for A in pyclass wrapers for B and C. But it's look ugly and bad at all.

[davidhewitt]

This is related to the discussion in #1637 (comment) .

In all honesty we should think more about this case, because some users will want to do it (and it's a natural analogy of Python / C's inheritance mechanism). But to do so requires quite some work in the internals of PyO3. Would be happy to chat more about this!