This is an area in which I haven't quite figured out how to communicate properly; I feel like I have a good understanding of how Rust maps to asm, but I don't know how to transfer that understanding to other people.
I'll certainly be reading your link below, thanks for that!
Would an updated and expanded Rust for C++ Programmers make sense as a companion to the book with references to concepts in the book along with low-level details on data structures or implementation? It would nice to see that and Nomicon more closely related and fully up-to-date.
It soulds like an informal "specification" of #[repr(c)] or #[repr(packed)] for common platforms would also be useful for FFI.
I'll certainly be reading your link below, thanks for that!