@Override
	public void dataTypeDeleted(DataType dt) {
		if (returnType == dt) {
			returnType = DataType.DEFAULT;
		}
		for (ParameterDefinition param : params) {
			if (param.getDataType() == dt) {
				param.setDataType(DataType.DEFAULT);
			}
		}
	}
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Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/model/data/FunctionDefinitionDataType.java