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I could uncomment the // line and it would compile fine. In my actual code, the Arc was important, so I couldn't use the line below.
Right, because `Arc<T>` is sized. When you write `impl<T> MustSized for Injected<Arc<T>>`, it's the same as if you wrote `impl<T: Sized> MustSized for injected<Arc<T>>`. Since `dyn Trait` isn't `Sized`, it doesn't apply. Adding `T: ?Sized` cancels the implied sized bound
