[swift-evolution] [Proposal idea] Improved interop for ErrorType->NSError

[Thorsten Seitz]

 I find it a little bit strange that your error handling function takes an optional in the first place.
The caller should only call an errror handler in case of an error, so you should already have unwrapped the optional. 

-Thorsten 

> Am 22.12.2015 um 18:30 schrieb Paul Cantrell via swift-evolution <swift-evolution at swift.org>:
> 
> func handleFileNotFound(error: ErrorType?)
>         {
>         if let error = error
>             {
>             if case MyError.FileNotFound(let url) = error
>                 { print(url) }
>             }
>         }
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