Yep! Even now it's not quite as bad as identical program structure. I mean, the high-level is fairly similar, but even now individual functions can look signifi

Yep! Even now it's not quite as bad as identical program structure. I mean, the high-level is fairly similar, but even now individual functions can look significantly different. Emacs' C is already largely written in a high-level, macro-rich style to deal with Lisp objects (tagged pointers). So Rust already gives wins there w.r.t. more explicit types and From/Into impls over macros. And over the last couple weeks there has been discussion about replacing xml.c with a native Rust backend for XML parsing.