Following this behavior, how would you want to write it naturally?

scope.m

- (NSString *)myMethod {
	NSString *str = nil;

	scope {
		NSAutoreleasePool *pool = [NSAutoreleasePool new];
		scope(exit)
			[pool drain];

		str = [[NSMutableString alloc] initWithFormat:@"%i", 42];

		for (int i = 0;i < 10;++i)
		scope {
			NSString *append = [something thatReturnsACopy];
			scope(exit) {
				[append release];
			}

			[str appendString:append];
		}
	}

	return [str autorelease];
}

- (void)myOtherMethod {
   scope {
       NSAutoreleasePool *pool = [NSAutoreleasePool new];
       scope(exit)
           [pool drain];

       NSString *str = [NSString stringWithFormat:@"%i", 42];
       if ([str length]) {
           // done
           return;
       }

       [self doMoreStuff];
       if (done)
           return;

       [self doEvenMoreStuff];
   }
}