import java.util.concurrent.StructuredTaskScope;
import java.util.concurrent.StructuredTaskScope.Joiner;

/** Joiner.awaitAll() existed in 25 and 26 and was removed in 27. */
public class AwaitAll {
    public static void main(String[] args) throws Exception {
        try (var scope = StructuredTaskScope.open(Joiner.<String>awaitAll())) {
            scope.fork(() -> "x");
            scope.join();
        }
    }
}