Open Radar

 
Summary:

Xcode reports a compiler error if I attempt to call -[B init] because I marked it as NS_UNAVAILABLE in A. However, since -init is an NS_DESIGNATED_INITIALIZER in NSObject, it shouldn’t be possible for an infinite recursion to occur because NS_DESIGNATED_INITIALIZERs should only delegate to a superclass NS_DESIGNATED_INITIALIZER.

Steps to Reproduce:
Compile the code below and try to initialize B with -[B init].

@interface A : NSObject

- (instancetype)init NS_UNAVAILABLE;
- (instancetype)initWithString:(NSString *)string NS_DESIGNATED_INITIALIZER;

@end

@interface B : A

- (instancetype)init NS_DESIGNATED_INITIALIZER;
- (instancetype)initWithString:(NSString *)string NS_UNAVAILABLE;

@end

@implementation A

- (instancetype)initWithString:(NSString *)string
{
  return [super init];
}

@end

@implementation B

- (instancetype)init
{
  return [super initWithString:@“B”];
}

@end

Expected Results:
Xcode should report no errors.

Actual Results:
Xcode reports that -[B init] is unavailable.