private static ArrayList<String> addPrototypeError(ArrayList<String> errList,
			PrototypeModel model) {
		if (model.isErrorPlaceholder()) {
			if (errList == null) {
				errList = new ArrayList<>();
			}
			else if (errList.size() > 4) {		// Only accumulate up to 5
				errList.add("...");
				return errList;
			}
			String message = "prototype: " + model.getName();
			errList.add(message);
		}
		return errList;
	}
Add a new PrototypeModel to the list of extensions with errors

@param errList is the list of errors
@param model is the PrototypeModel with errors
@return the updated list
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/ProgramCompilerSpec.java