158     droppable: IndexSet<u32>,  field
229         assert!(self.droppable.insert(id));  in insert()
239         self.droppable.swap_remove(&id);  in remove()
264         self.droppable.swap_remove(&id);  in start()
287         assert!(self.droppable.insert(id));  in stop()
357         if self.futures.readers.droppable.len() > 0 {  in generate()
360         if self.futures.writers.droppable.len() > 0 {  in generate()
384         if self.streams.readers.droppable.len() > 0 {  in generate()
387         if self.streams.writers.droppable.len() > 0 {  in generate()
490                 assert!(self.futures.writers.droppable.swap_remove(&id));  in generate()
617                         assert!(self.futures.writers.droppable.swap_remove(&id));  in generate()
642                 let set = &self.futures.readers.droppable;  in generate()
654                     assert!(self.futures.writers.droppable.insert(id));  in generate()
658                 let set = &self.futures.writers.droppable;  in generate()
734                 let set = &self.streams.readers.droppable;  in generate()
745                 let set = &self.streams.writers.droppable;  in generate()