Test retain cycle with block parameters

foo.m

#import <Foundation/Foundation.h>

@interface Foo : NSObject
@end

@implementation Foo
- (void) setBar:(void(^)(void))block {}
- (void) doBaz:(void(^)(void))block{}
@end

int main(int argc, const char * argv[])
{
    @autoreleasepool {
        Foo * f = [Foo new];
        [f doBaz:^() { NSLog(@"%@",f); }];  // No warning here
        [f setBar:^() { NSLog(@"%@",f); }]; // Clang outputs a retain-cycle warning here
    }
    return 0;
}