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subscriber: document boxed
Layer
s (tokio-rs#2023)
Currently, there is an `impl<S: Subscriber> Layer for Box<dyn Layer<S> + Send + Sync>` intended to allow type-erasing a subscriber. This change improves the documentation on runtime configuration of layers to include an example of using `Box` to type-erase a layer. Signed-off-by: Eliza Weisman <[email protected]>
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