Open Radar

 
Summary:
In Swift 1.1, you could override the subscripting methods in Swift, even if they were declared on an Objective-C superclass. This is no longer possible in Swift 1.2, no matter where the `override` keyword is placed.

Steps to Reproduce:
1) Create Objective-C Class as follows
@interface Model : NSObject
- (id)objectForKeyedSubscript:(NSString *)subscript;
- (void)setObject:(id)object forKeyedSubscript:(NSString *)key;
@end

@implementation Model
- (id)objectForKeyedSubscript:(NSString *)subscript { return nil; }
- (void)setObject:(id)object forKeyedSubscript:(NSString *)key { }
@end

2) Import the above interface in a bridging header

3) Create the following subclass

class ModelSubclass: Model {
    subscript(key: String) -> String {
        get { return "hi" }
        set(value) { println(value) }
    }
}

Expected Results:
The code sample should compile.

Actual Results:
There are two compilation errors, subscript getter overrides Objective-C method 'objectForKeyedSubscript:' from superclass 'Model' and subscript setter overrides Objective-C method 'setObject:forKeyedSubscript:' from superclass 'Model'

Regression:
This is a regression in Xcode 6.3 Beta 1 from Xcode 6.1.1 and Xcode 6.2 Betas, coinciding with Swift 1.2.