@Override
	public void findReferences(Program program, DataType dataType,
			Consumer<DataTypeReference> callback, TaskMonitor monitor) throws CancelledException {
		// stub
	}
A simple spy to report when and how the finder service is called.
Ghidra/Features/Decompiler/src/test.slow/java/ghidra/app/plugin/core/decompile/StubDataTypeReferenceFinder.java