ashb commented on a change in pull request #16732:
URL: https://github.com/apache/airflow/pull/16732#discussion_r665988385
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File path: airflow/models/baseoperator.py
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@@ -1540,22 +1541,24 @@ def inherits_from_dummy_operator(self):
return getattr(self, '_is_dummy', False)
-def chain(*tasks: Union[BaseOperator, Sequence[BaseOperator]]):
+def chain(*tasks: Union[BaseOperator, "XComArg", Sequence[BaseOperator],
Sequence["XComArg"]]):
Review comment:
```suggestion
def chain(*tasks: Union[BaseOperator, "XComArg",
Sequence[Union[BaseOperator, "XComArg"]]]):
```
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