70 pub struct OnceCell<T> {  struct
76 impl<T> Default for OnceCell<T> {  argument
82 impl<T: fmt::Debug> fmt::Debug for OnceCell<T> {  implementation
90 impl<T: Clone> Clone for OnceCell<T> {  implementation
96 impl<T: PartialEq> PartialEq for OnceCell<T> {  implementation
102 impl<T: Eq> Eq for OnceCell<T> {}  implementation
104 impl<T> Drop for OnceCell<T> {  implementation
115 impl<T> From<T> for OnceCell<T> {  implementation
127 impl<T> OnceCell<T> {  implementation
409 unsafe impl<T: Sync + Send> Sync for OnceCell<T> {}  implementation
414 unsafe impl<T: Send> Send for OnceCell<T> {}  implementation