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Jacob Pratt
209703af85
Add test for dynamic dispatch + Pin::new soundness While working on [the `#[derive(SmartPointer)]` RFC][1], I realized that the soundness of <code>impl [DispatchFromDyn](https://doc.rust-lang.org/stable/std/ops/trait.DispatchFromDyn.html) for [Pin](https://doc.rust-lang.org/stable/std/pin/struct.Pin.html)</code> relies on the restriction that you can't implement [`Unpin`](https://doc.rust-lang.org/stable/std/marker/trait.Unpin.html) for trait objects. As far as I can tell, the relevant error exists to solve some unrelated issues with coherence. To avoid cases where `Pin` is made unsound due to changes in the coherence-related errors, add a test that verifies that unsound use of `Pin` and `DispatchFromDyn` does not become allowed in the future. [1]: https://github.com/rust-lang/rfcs/pull/3621