[swift-evolution] [Pitch] allow non-nominal type extension

[Cao Jiannan]

It is just same as current grammar:

extension TrackCountProvider where Self : PublishDateProvider { ... }

with a more logical format

extension TrackCountProvider & PublishDateProvider { ... }

> e.g.
> 
> extensionTrackCountProvider&PublishDateProvider{
> vartrackCountAndPublishDateText:String{
> varinfos: [String] = []
> 
> iflettrackCount = trackCount{
> infos.append("\(trackCount)")
> 
> }
> 
> ifletpublishDateText = publishDate?.text {
> infos.append(publishDateText)
> }
> 
> returninfos.joined(separator: seperator)
> }
> }
> 
> 
> 
> 
> 
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