How to use the makefun.main.UndefinedSymbolError function in makefun

# Does not work: if `self.i` is used in the code, `i` will appear here
    # if func_code is not None:
    #     for name in func_code.co_names:
    #         try:
    #             eval(name, _evaldict)
    #         except NameError:
    #             raise UndefinedSymbolError("Symbol `%s` does not seem to be defined yet. Make sure you apply "
    #                                        "`compile_fun` *after* all required symbols have been defined." % name)

    if recurse and func_closure is not None:
        # recurse-compile
        for name, cell in zip(func_code.co_freevars, func_closure):
            if name in except_names:
                continue
            if name not in _evaldict:
                raise UndefinedSymbolError("Symbol %s does not seem to be defined yet. Make sure you apply "
                                           "`compile_fun` *after* all required symbols have been defined." % name)
            try:
                value = cell.cell_contents
            except ValueError:
                # empty cell
                continue
            else:
                # non-empty cell
                try:
                    # note : not sure the compilation will be made in the appropriate order of dependencies...
                    # if not, users will have to do it manually
                    _evaldict[name] = compile_fun_manually(value,
                                                           recurse=recurse, except_names=except_names,
                                                           _evaldict=_evaldict)
                except (UnsupportedForCompilation, SourceUnavailable):
                    pass