Are you saying that the non-looping generators are grossly insufficient for Rust? This matters because the non-looping generators have a fixed monthly subscription cost, whereas the looping ones could cost per call.
I’m not sure what you mean here. All of my coding is done in a loop; something writes, something compiles, something fixes, once compiling, something tests and writes more, repeat until you need bed.
If you mean “can GitHub copilot author long syntactically, type, and memory-safe- correct rust code in one shot?” Then the answer is “not right now”