Why does a new Objective-C project's boilerplate contain an autorelease pool block, but a new Swift project doesn't?

 

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#import <Cocoa/Cocoa.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        // Setup code that might create autoreleased objects goes here.
    }
    return NSApplicationMain(argc, argv);
}