@Override
	public CodeBlock next() throws CancelledException {
		if (nextSub == null)
			hasNext();
		CodeBlock retSub = nextSub;
		nextSub = null;
		return retSub;
	}
@see ghidra.program.model.block.CodeBlockIterator#next()
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/block/PartitionCodeSubIterator.java