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## Motivation `Value` was already implemented for `dyn Error + 'static`, but rust doesn't silently coerce trait objects. This means that passing an error of type `dyn Error + Send + Sync + 'static` would not work. This is related to #1308. ## Solution Add impls for `dyn Error + …` variants for `Send`, `Sync`, and `Send + Sync`. These extra impls just delegate to the existing `dyn Error + 'static` impl. Also update one of the examples to use `dyn Error + Send + Sync` to demonstrate that this works. Refs: #1308
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