test

        if (file.is_open()) {

            std::string content((std::istreambuf_iterator<char>(file)),

                                 std::istreambuf_iterator<char>());

            // Record the included file in MAKEFILE_LIST before parsing it, so

            // $(lastword $(MAKEFILE_LIST)) resolves to this file during its

            // own parse (Kbuild relies on this for $(src)/$(obj)).

            {

                auto& ml = mf.variables["MAKEFILE_LIST"];

                ml.value += (ml.value.empty() ? "" : " ") + path;

                ml.flavor = VarFlavor::Simple;

            }

            // An included makefile is parsed in its own conditional context and

            // must have balanced conditionals; it may not close a conditional

            // opened by the parent. parse_string() resets cond_stack_/define