[swift-evolution] typed throws

[Christopher Kornher]

> On Aug 18, 2017, at 7:38 AM, Matthew Johnson via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I would like to reiterate the point I made in the question that spawned this thread: there are *many* Swift libraries for writing async code of various sorts which are *already* using typed errors via `Result<Value, ErrorType: Error>`.  We don't have to speculate about how this feature might be used and what kind of benefits might be realized.  We can have a discussion about what people are already doing and determine whether this model should be supported in the async / await world or not.  What do you think of putting a call out to the broader Swift community to bring us concrete examples of how they are benefiting from using typed errors in async code.

I have found this “feature" has been painful to use. I have been forced to wrap hetrogenous errors in a custom error type just to satisfy these ill-conceived APIs. i have never found any benefit to ```ErrorType: Error``` generic parameter. … Any. Ever.

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