That's not true at all, even something as low-level as C shifts the semantics dramatically away from how assembler works. C functions conceptually in a half-as

That's not true at all, even something as low-level as C shifts the semantics dramatically away from how assembler works. C functions conceptually in a half-assed attempt at making the computer behave marginally more like a Harvard Machine than a Von Neumann one. OTOH, coroutines are easier to bring about in assembler than in C.