> On Sep 13, 2016, at 8:14 PM, Rick Mann <rm...@latencyzero.com> wrote:
>
> But the Apple declaration (accessible via Xcode) of the method it's based on
> looks like this:
>
> open func enumerator(at url: URL,
> includingPropertiesForKeys keys: [URLResourceKey]?,
> options mask: FileManager.DirectoryEnumerationOptions = [],
> errorHandler handler: (@escaping (URL, Error) -> Bool)? = nil)
> -> FileManager.DirectoryEnumerator?
>
> handler is optional, but has @escaping. Is this an artifact of how Xcode
> presents system header files?
>
That’s certainly funky. Might be that or a bug in the AST printer.
>
>> On Sep 13, 2016, at 20:11 , Michael Ilseman <milse...@apple.com> wrote:
>>
>> TL;DR: The optional is already escaping, due to the fact that “T?" is sugar
>> for Optional<T>, and the noescape-by-default rule only applies to types in
>> immediate parameter position. Current Swift master has much better
>> diagnostics for this case.
>>
>> There is not currently a general solution involving escapability of closure
>> types used a generic parameters or tuple members, though such a thing would
>> be useful in Swift 4.
>>
>>> On Sep 13, 2016, at 7:42 PM, Shawn Erickson via swift-users
>>> <swift-users@swift.org> wrote:
>>>
>>> The following is the earlier thread I was talking about.
>>>
>>> [swift-users] Swift 3 (Xcode 8 GM) issue with @escaping
>>>
>>> -Shawn
>>>
>>> On Tue, Sep 13, 2016 at 7:31 PM Shawn Erickson <shaw...@gmail.com> wrote:
>>> I hit this issue as well. I had an early email on this list regarding do
>>> this topic, not in a situation to search for it. It is a short coming in
>>> how escaping can be applied to things like optional closures.
>>>
>>> I was in the process of authoring an email for swift evolution about it and
>>> haven't yet gotten around to filing a defect about it.
>>>
>>> -Shawn
>>> On Tue, Sep 13, 2016 at 7:27 PM Rick Mann via swift-users
>>> <swift-users@swift.org> wrote:
>>> I'm trying to write this function. The errorHandler: parameter is modeled
>>> after the NSFileManager enumerate() function. If I include the @escaping
>>> you see there, I get the error "@escaping may only be applied to parameters
>>> of function type".
>>>
>>> The second parameter, iterator:, seems to have no problems with @escaping.
>>>
>>> func
>>> iterate(directory inURL: URL?,
>>> includingPropertiesForKeys: [URLResourceKey]? = nil,
>>> options: FileManager.DirectoryEnumerationOptions = [],
>>> errorHandler inErrorHandler: (@escaping (URL, Error) -> Bool)? = nil,
>>> iterator inIterator: (@escaping (URL) throws -> ())) rethrows
>>> {
>>> }
>>>
>>> I'm not sure why I can't apply @escaping here. Can anyone enlighten me?
>>> Thank you.
>>>
>>> --
>>> Rick Mann
>>> rm...@latencyzero.com
>>>
>>>
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>>
>
>
> --
> Rick Mann
> rm...@latencyzero.com
>
>
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