@Override
	public Symbol next() {
		if (hasNext()) {
			Symbol s = nextSymbol;
			nextSymbol = null;
			return s;
		}
		return null;
	}
@see ghidra.program.model.symbol.SymbolIterator#next()
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/symbol/TypeFilteredSymbolIterator.java