245 enum OpStatus {  enum
252     ops: Slab<OpStatus>,
289             entry.insert(OpStatus::Nop);  in wake()
395                 match mem::replace(op, OpStatus::Completed(Some(result))) {  in run()
397                     OpStatus::Nop => mem::drop(ring.ops.remove(token)),  in run()
398                     OpStatus::Pending(data) => {  in run()
408                     OpStatus::Completed(_) => panic!("uring operation completed more than once"),  in run()
422             OpStatus::Nop => panic!("`get_result` called on nop"),  in get_result()
423             OpStatus::Pending(data) => {  in get_result()
430             OpStatus::Completed(res) => {  in get_result()
443                 OpStatus::Nop => panic!("`cancel_operation` called on nop"),  in cancel_operation()
444                 OpStatus::Pending(data) => {  in cancel_operation()
457                 OpStatus::Completed(_) => {  in cancel_operation()
492         entry.insert(OpStatus::Pending(OpData {  in submit_poll()
527         entry.insert(OpStatus::Pending(OpData {  in submit_fallocate()
550         entry.insert(OpStatus::Pending(OpData {  in submit_fsync()
600         entry.insert(OpStatus::Pending(OpData {  in submit_read_to_vectored()
650         entry.insert(OpStatus::Pending(OpData {  in submit_write_from_vectored()
675                 OpStatus::Nop => {}  in drop()
676                 OpStatus::Pending(data) => {  in drop()
688                 OpStatus::Completed(_) => {}  in drop()