/guava/guava/src/com/google/common/graph/DirectedMultiNetworkConnections.java
N node = super.removeOutEdge ( edge ) ; Multiset<N> successors = getReference ( successorsReference ) ;
checkState(predecessors.remove(node)); } return node; } @Override public N removeOutEdge(E edge) { <extra_id_0> if (successors != null) { checkState(successors.remove(node)); } return node; } @Override