a scope in which these can
      exist by calling enter_cfunc_scope/exit_cfunc_scope (these are for
      sanity checking and forward compatibility). Created insertion points
      looses this scope and cannot access it.
    - marker: Not copied to insertion point
    - filename_table, filename_list, input_file_contents: All codewriters
      coming from the same root share the same instances simultaneously.
    ©