Flows should be repr(C)

[Ms2ger]

We have code that extracts the BaseFlow through

pub fn base<T: ?Sized + Flow>(this: &T) -> &BaseFlow {
    unsafe {
        let obj = mem::transmute::<&&T, &raw::TraitObject>(&this);
        mem::transmute::<*mut (), &BaseFlow>(obj.data)
    }
}

This relies on the BaseFlow being the first field in any Flow implementation.

(Perhaps this also means Flow should be an unsafe trait…)

[stshine]

Argh, the story of inheritence.

[DemiMarie]

Rust really needs an object system. Perhaps one can be implemented as a compiler plugin.

[nox]

I think this is still true.

[dralley]

Does layout 2020 address this?

[nox]

Yes, but 2013 is still a thing for now.