Open Radar

 
Summary:
In Xcode 6, an @objc(ClassName) could be used to an NSObject class with its name containing non-ascii characters in Swift. By doing so, we could expose it to Objective-C with the alternative name. 

However, in Xcode 7 and Swift 2, it will not compile with an error: "Parameter of 'swift_name' attribute must be an ASCII identifier string", which causes classes with non-ascii characters cannot be used in Objective-C.

Steps to Reproduce:
1. Create a Swift class like this in a project: 
@objc(MyClass)
class 我的类: NSObject {
    @objc(greeting:)
    func 打招呼(名字: String) {
        print("哈喽，\(名字)")
    }
}

2. In the same project, create an Objective-C class and add "#import {ProjectName}-Swift.h"

3. Not compile with "Parameter of 'swift_name' attribute must be an ASCII identifier string"

Expected Results:
It should compile and we can use
 [[[MyClass alloc] init] greeting:@"John"]; 
to log out a string: "哈喽，John"

Actual Results:
Not compile

Version:
Xcode 7 (7A218)