@Override
	public DataType clone(DataTypeManager dtm) {
		if (dtm == getDataTypeManager()) {
			return this;
		}
		return new MissingBuiltInDataType(categoryPath, missingBuiltInName, missingBuiltInClassPath,
			dtm);
	}
{@return classpath of missing built-in datatype for which this type is standing-in for}
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/MissingBuiltInDataType.java