Objective-C blocks empty param list is not void

empty-block-param-list.m

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {

    @autoreleasepool {
        // note that an empty list here doesn't mean "no params"
        void (^printNSArray)();

        printNSArray = ^(NSArray *items) {
            // deliberately safe to prove a point
            NSLog(@"%@", items);
        };

        // an empty list means we actually pass whatever we'd like
        printNSArray(@[@"foo", @"bar", @"baz"]);
        printNSArray(@"quux");
        printNSArray([[NSObject alloc] init]);
    }

    return 0;
}