Rust didn't invent the terminology. Rust has stackless coroutines. Go has stackful coroutines. The literal distinction is that stackless coroutines exist indep

Rust didn't invent the terminology. Rust has stackless coroutines. Go has stackful coroutines. The literal distinction is that stackless coroutines exist independently of a stack: you have a state machine object that, when it's resumed into, is put onto the stack and calls normal functions through the run-time stack. Stackful coroutines are essentially lightweight threads (hence "green threads" or "virtual threads"): the coroutine comes with a miniature run-time stack. In practice, stackless coroutines are more space efficient and have lower context-switch costs. A big factor for Rust specifically is interoperating with C. Stackful coroutines make writing "straight-line" code simpler (no function coloring) but introduce more overhead.