[pypy-issue] Issue #2113: Calling str.expandtabs(0) crashes with a floating point exception (pypy/pypy)

[Jason Madden]

New issue 2113: Calling str.expandtabs(0) crashes with a floating point exception
https://bitbucket.org/pypy/pypy/issues/2113/calling-strexpandtabs-0-crashes-with-a

Jason Madden:

In PyPy 2.5.0, 2.6.0 and a recent 2.7 build, under both OS X and 64-bit Linux, using `expandtabs(0)` on either a byte string or unicode string crashes with a floating point exception (8). 

This is very easy to reproduce:

```
$ bin/pypy-2.6-linux_x86_64-portable/bin/pypy
Python 2.7.9 (295ee98b69288471b0fcf2e0ede82ce5209eb90b, Jun 01 2015, 17:30:13)
[PyPy 2.6.0 with GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>>> t = u'strict digraph {\n\t1 -> 2;\n\t2 -> 3;\n}\n'
>>>> t.expandtabs(0)
Floating point exception
$
```

The OS X crash report states that it's of type ``EXC_ARITHMETIC`` and code ``EXC_I386_DIV (division by zero)``. 

This was noticed during the unittests for pygraphviz.