If you're talking about gccrs, no, it's a full reimplementation. I think your parent is saying developers can use rustc (including its borrow checker) while ite

If you're talking about gccrs, no, it's a full reimplementation. I think your parent is saying developers can use rustc (including its borrow checker) while iterating, then produce the release builds using gccrs from code that is known to borrow check.