Objective-C protocols aren't imported in Swift as class protocols

Originator:info
Number:rdar://19974021 Date Originated:26-Feb-2015 12:20 PM
Status:Open Resolved:
Product:Developer Tools Product Version:8.0
Classification:Other Bug Reproducible:Always
 
Summary:
For example, protocol NSObjectProtocol is not tagged as `class`, which means that a struct could conform to it, but that wouldn’t make sense.

Steps to Reproduce:
Create an Objective-C protocol: `P`.

Expected Results:
It is imported in Swift as `@objc protocol P` or at least `protocol P: class`.

Actual Results:
Protocol is defined simply as `protocol P`.

Notes: 
The compiler actually prevents you from doing something like `struct S: NSObjectProtocol`, with an error “non-class type ’S’ cannot conform to class protocol ‘NSObjectProtocol’”, but I see no indication of that in the Swift auto generated header.

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