174     entries: TryVec<Entry<T>>,
192 enum Entry<T> {  enum
331                 Entry::Free { next_free } => next_free,  in try_alloc()
332                 Entry::Occupied { .. } => unreachable!(),  in try_alloc()
335             self.entries[index.index()] = Entry::Occupied(value);  in try_alloc()
349                     .push(Entry::Free { next_free: None })  in try_alloc_index()
402             Entry::Occupied(x) => Some(x),  in get()
403             Entry::Free { .. } => None,  in get()
420             Entry::Occupied(x) => Some(x),  in get_mut()
421             Entry::Free { .. } => None,  in get_mut()
429             Some(Entry::Occupied(_)) => true,  in contains()
430             None | Some(Entry::Free { .. }) => false,  in contains()
444             Entry::Free { next_free: None },  in dealloc()
447             Entry::Free { .. } => panic!("attempt to deallocate an entry that is already vacant"),  in dealloc()
448             Entry::Occupied(value) => {  in dealloc()
450                 self.entries[id.0.index()] = Entry::Free { next_free };  in dealloc()
469                 Entry::Occupied(x) => Some((Id(EntryIndex::new(i)), x)),  in iter()
470                 Entry::Free { .. } => None,  in iter()
486                 Entry::Occupied(x) => Some((Id(EntryIndex::new(i)), x)),  in iter_mut()
487                 Entry::Free { .. } => None,  in iter_mut()
507                 Entry::Occupied(x) => Some((Id(EntryIndex::new(i)), x)),  in drain()
508                 Entry::Free { .. } => None,  in drain()