Avoiding repeated `dyn` indirection

[quinedot]

@SkiFire13

I believe you can avoid having to implement it if you put it on a helper trait Helper such that Helper is blanket implemented for any T: Trait and Helper is a supertrait of Trait.

I second this. It's useful in many dyn scenarios where you want a default body for T: Sized and want the compiler to supply the implementation for dyn Trait. Here's a recent example.^[1]

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1. from this thread ↩︎