[Pitch 2] Objective-C implementations in Swift

[grynspan (Jonathan Grynspan)]

@beccadax

The most notable change from the previous draft is that we have changed the attribute from @objcImplementation to @implementation; this is because there has been significant interest in a similar feature for @_cdecl functions and even some for an equivalent C++ feature

Perhaps @implementation(objc) so that the language is explicit, then? Or are you expecting the compiler can always infer the language correctly?