# Sympy integration algorithm towards -infinity

Following achrzesz hint about integral's algorithm option, I tried (Sage 4.7.2):

```
integral(1/x^2, x, -infinity, -1, algorithm='sympy')
```

Unfortunately, I got:

```
Traceback (click to the left of this block for traceback)
...
AttributeError: 'MinusInfinity' object has no attribute '_sympy_'
```

What's going wrong?

The workarounds are good for now. I've opened the auspicious ticket # 12345 (http://trac.sagemath.org/sage_trac/ticket/12345) for the underlying issue.