1.2.6.4. alpha.osx.cocoa.MissingInvalidationMethod (ObjC)
Check that the invalidation methods are present in classes that contain invalidatable instance variables.

Examples:

@protocol Invalidation <NSObject>
- (void)invalidate
  __attribute__((annotate("objc_instance_variable_invalidator")));
@end

@interface NeedInvalidation : NSObject <Invalidation>
@end

@interface MissingInvalidationMethodDecl : NSObject {
  NeedInvalidation *Var; // warn
}
@end

@implementation MissingInvalidationMethodDecl
@end