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Impl Default for PhantomPinned
`PhantomPinned` is just a marker type, with an obvious default value (the only value). So I can't think of a reason not to do this. Sure, it's used in exotic situations with unsafe code. But the people writing that code can decide for themselves if they can derive `Default`, and in many situations the derived impl will make sense:
```rust
#[derive(Default)]
struct NeedsPin {
marker: PhantomPinned,
buf: [u8; 1024],
ptr_to_data: Option<*const u8>,
}
```
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