File: Bug12.java

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package inference.guava;

import java.util.Map;

public class Bug12 {

    private static Map<? extends Enum, LockGraphNode> getOrCreateNodes(
            Map<? extends Enum, LockGraphNode> existing,
            Map<? extends Enum, LockGraphNode> created) {
        return firstNonNull(existing, created);
    }

    public static <T> T firstNonNull(T first, T second) {
        throw new RuntimeException();
    }

    private static class LockGraphNode {}
}