ipython/ipython — pull request #2544 by bfroehle (2012-11-02 21:31:25+00:00)
Title: Infinite loop when multiple debuggers have been attached.

Replaces pull-request #2388.

Fixed infinite loop on exit in the event of where multiple debuggers have been attached an there is an uncaught exception.

Test code:

```python
from IPython.core.debugger import Tracer;
Tracer()
Tracer()
raise Exception
```

Pinging @DamianHeard to review.