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ruff/crates
Charlie Marsh f8d46d09ef Implement asyncio-dangling-task to track asyncio.create_task calls (#2935)
This rule guards against `asyncio.create_task` usages of the form:

```py
asyncio.create_task(coordinator.ws_connect())  # Error
```

...which can lead to unexpected bugs due to the lack of a strong reference to the created task. See Will McGugan's blog post for reference: https://textual.textualize.io/blog/2023/02/11/the-heisenbug-lurking-in-your-async-code/.

Note that we can't detect issues like:

```py
def f():
    # Stored as `task`, but never used...
    task = asyncio.create_task(coordinator.ws_connect())
```

So that would be a false negative. But this catches the common case of failing to assign the task in any way.

Closes #2809.
2023-02-15 15:19:03 -05:00
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2023-02-15 12:06:58 -05:00