warning: non-canonical implementation of `clone` on a `Copy` type
   --> src/oneshot.rs:123:29
    |
123 |       fn clone(&self) -> Self {
    |  _____________________________^
124 | |         Self {
125 | |             ptr: self.ptr,
126 | |             _phantom: PhantomData,
127 | |         }
128 | |     }
    | |_____^ help: change this to: `{ *self }`
    |
    = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#non_canonical_clone_impl
    = note: `#[warn(clippy::non_canonical_clone_impl)]` on by default