Comment by cogman10

Rust's borrowing rules might force you to make different architecture choices than you would with C. But that's not what I was thinking about.

For a given rust function, where you might expect a C programmer to need to interact due to a change in the the C code, most of the lifetime rules will have already been hammered out before the needed updates to the rust code. It's possible, but unlikely, that the C programmer is going to need to significantly change what is being allocated and how.