public boolean isBadReferenceSymbol(Symbol s) {
		Memory memory = getMemory(s);
		if (memory == null) {
			return true;
		}
		Address a = s.getAddress();
		if (a.isMemoryAddress()) {
			return !memory.contains(s.getAddress());
		}
		return false;
	}
Returns true if symbol is at a non-existent address
@param s the symbol to check
@return boolean true if symbol is bad
Ghidra/Features/Base/src/main/java/ghidra/app/util/SymbolInspector.java