{"ast_node_type":"other","tokens":[{"end":91,"kind":"keyword","start":0,"text":"//"}]}
                    // calls to `poll_next`. In user code, this would probably be a call to
                    // to make_lowered_await with `FutureKind::AsyncIterator` which will generator
                    // `Pin::as_mut` but here it's easy enough to do `new_unchecked`.