<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def generate_func_code_block(self, definition, variable, variable_name, clear_variables=False):
 """ Creates validation rules for current definition. """

        backup = self._definition, self._variable, self._variable_name
        self._definition, self._variable, self._variable_name = definition, variable, variable_name
        if clear_variables:
            backup_variables = self._variables
            self._variables = set()

        self._generate_func_code_block(definition)

        self._definition, self._variable, self._variable_name = backup
        if clear_variables:
            self._variables = backup_variables