Hey @rustlang twitter: any particular reason that there isn't an instance of std::error::Error for Arc<dyn std::error::Error>?
Would be quite useful when you want a cloneable dyn error for just exploring things without being bogged down in error handling intricacies...
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Arc<dyn Error> and Box<dyn Error> cannot impl Error due to the overlap rule which says currently in rust you cannot have two generic trait impls both be valid for the same type. From<T> for Arc<T> and From<T> for T would overlap if Arc<dyn Error> itself could coerce to dyn Error
This would be true if there was `impl<E: Error> From<E> for Arc<dyn Error>`, but there is no such impl. Only for Box.
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Oh yea you need a concrete impl don't you, I forgot the From<T> doesn't work as a coersion site for dyn Error.
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Either way, you can't meaningfully get what
@klaehnr wants which is presumably a catch all error type via Arc that itself impls Error. Side question, Sian do you know if specialization is planned to allow overlap? - 9 more replies
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