pytest-dev__pytest-11143

Based on the error traceback in the issue, I can see the problem. The issue is at line 760 in _pytest/assertion/rewrite.py:

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Based on the error traceback in the issue, I can see the problem. The issue is at line 760 in `_pytest/assertion/rewrite.py`:

```python
return "PYTEST_DONT_REWRITE" in docstring
```

The problem is that when the first expression in a Python file is a number (like `0`), it's being mistakenly treated as a docstring. When you try to use `in` operator on an integer, Python raises `TypeError: argument of type 'int' is not iterable`.

The fix needs to check if the docstring is actually a string before checking if it contains `"PYTEST_DONT_REWRITE"`.

Looking at the traceback:
- Line 695: `if self.i

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