Generators with UnpinCell

In July, I described a way to make pinning more ergonomic by integrating it more fully into the language. Last week, I develoepd that idea further with the notion of UnpinCell: a wrapper type that lets a user take an &pin mut UnpinCell<T> and produce an &mut T, similar to how other cells let a user take a shared reference to the cell and produce a mutable reference to its contents....

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