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>that is, all the information that would be present in a typical Rust error handling scenario as well --- is encoded in the type tree of the errors.

it's only present when you downcast though?

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It's not super ergonomic, but the information is there, in about the same density as it would be in a Rust app, supporting the same error handling strategies (ie, discriminating between transient and durable errors, &c).

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