def _task_validations(self, config: "PoeConfig", task_specs: "TaskSpecFactory"):
            """
            Perform validations on this TaskSpec that apply to a specific task type
            """
            for subtask in self.subtasks:
                if subtask.args:
                    raise ConfigValidationError(
                        "Unsupported option 'args' for task declared inside sequence"
                    )

                subtask.validate(config, task_specs)

            Perform validations on this TaskSpec that apply to a specific task type
            
poethepoet/task/sequence.py