#vulnerable code 
                                void buildFunctionType() {
        Scope t = BaseFunction.getTable();

        for (String s : list("func_doc", "__doc__", "func_name", "__name__", "__module__")) {
            t.update(s, new Url(DATAMODEL_URL), BaseStr, ATTRIBUTE);
        }

        Binding b = synthetic(t, "func_closure", new Url(DATAMODEL_URL), newTuple(), ATTRIBUTE);
        b.markReadOnly();

        synthetic(t, "func_code", new Url(DATAMODEL_URL), unknown(), ATTRIBUTE);
        synthetic(t, "func_defaults", new Url(DATAMODEL_URL), newTuple(), ATTRIBUTE);
        synthetic(t, "func_globals", new Url(DATAMODEL_URL),
                new DictType(BaseStr, Indexer.idx.builtins.unknown), ATTRIBUTE);
        synthetic(t, "func_dict", new Url(DATAMODEL_URL),
                new DictType(BaseStr, Indexer.idx.builtins.unknown), ATTRIBUTE);

        // Assume any function can become a method, for simplicity.
        for (String s : list("__func__", "im_func")) {
            synthetic(t, s, new Url(DATAMODEL_URL), new FunType(), METHOD);
        }
    } 
                            #location 9 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                String[] list(String... names) {
        return names;
    }