code: def generate_func_code_block(self, definition, variable, variable_name, clear_variables=False):
          
          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
docs: Creates validation rules for current definition.