41 pub struct Lazy<T, F = fn() -> T> {  struct
46 impl<T: fmt::Debug, F> fmt::Debug for Lazy<T, F> {  argument
57 unsafe impl<T, F: Send> Sync for Lazy<T, F> where Once<T>: Sync {}  implementation
60 impl<T, F> Lazy<T, F> {  impl
63     pub const fn new(f: F) -> Lazy<T, F> {  in new()
64         Lazy { cell: Once::new(), init: Cell::new(Some(f)) }  in new()
68 impl<T, F: FnOnce() -> T> Lazy<T, F> {  implementation
83     pub fn force(this: &Lazy<T, F>) -> &T {  in force()
91 impl<T, F: FnOnce() -> T> Deref for Lazy<T, F> {  implementation
94         Lazy::force(self)  in deref()
98 impl<T: Default> Default for Lazy<T> {  implementation
100     fn default() -> Lazy<T> {  in default()
101         Lazy::new(T::default)  in default()