Watch out: the compiler in Xcode 7.1b3 is not detecting mismatched Obj-C return 
types, at least for methods that return objects. For example, the following 
compiles with no warnings, even with all typical warning flags enabled:

@interface Foo : NSObject
- (NSString*) name;
@end

@implementation Foo
- (NSSet*) name { return nil; }
@end

Reported to Apple as rdar://23195007

—Jens
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