Issue with weak property not getting set to nil when rac_willDeallocSignal is attached.

rac_willDeallocSingal_learning_teest.m

#import <ReactiveCocoa/ReactiveCocoa.h>
#import <SenTestingKit/SenTestingKit.h>

@interface rac_signal_testTests : SenTestCase

@end

@implementation rac_signal_testTests
-(void)test_willDeallocSignal_applied_to_strong_reference_works_as_expected_with_local_weak_reference{
    id val = [@{} mutableCopy];
    id __weak weak_val = val;
    
    __block BOOL hitNext = NO;
    [[val rac_willDeallocSignal] subscribeCompleted:^{
        hitNext = YES;
    }];
    
    val = nil;
    STAssertNil(val, nil);
    STAssertNil(weak_val, nil);
    STAssertTrue(hitNext, nil);
}

-(void)test_willDeallocSignal_applied_to_weak_reference_prevents_weak_reference_from_being_released{
    id val = [@{} mutableCopy];
    id __weak weak_val = val;
    
    __block BOOL hitNext = NO;
    [[weak_val rac_willDeallocSignal] subscribeCompleted:^{
        hitNext = YES;
    }];
    
    //would expect, as in the test above for this to cause weak_val to be set to nil because it's
    //referenced object has been dealloc'd due to no strong references.
    val = nil;
    STAssertNil(val, nil);
    
    //These two asserts fail.
    STAssertNil(weak_val, nil);
    STAssertTrue(hitNext, nil);
}
@end