> I think you could ignore C++ tokens and just pay attention to the preprocessor directives when figuring out e.g. what to #include, because strings couldn't sp

> I think you could ignore C++ tokens and just pay attention to the preprocessor directives when figuring out e.g. what to #include, because strings couldn't span multiple lines, so you could easily identify the directives with a # in the beginning of the line. char *cstr = "This \ #is a valid " "C string"; If I understand you correctly, is this a counterexample?