[pypy-issue] Issue #3063: RPython Traceback when using aggdraw (pypy/pypy)

[TheoL]

New issue 3063: RPython Traceback when using aggdraw
https://bitbucket.org/pypy/pypy/issues/3063/rpython-traceback-when-using-aggdraw

TheoL:

When using aggdraw with Pillow there is a core dump.

To reproduce run:

```
import aggdraw
from PIL import Image

if __name__ == '__main__':
    image = Image.new("RGB", (720, 270))
    draw = aggdraw.Draw(image)
```

And the output is:

```
 % python pypy-error.py
RPython traceback:
  File "pypy_module_cpyext_5.c", line 65268, in W_PyCFunctionObject_call_varargs
  File "pypy_module_cpyext_5.c", line 65620, in generic_cpy_call__StdObjSpaceConst_funcPtr_SomeI_8
  File "pypy_module_cpyext_1.c", line 35516, in from_ref
  File "pypy_module_cpyext_1.c", line 35560, in from_ref
Fatal RPython error: AssertionError
zsh: abort (core dumped)  python pypy-error.py
```

‌

Versions are:

Python 3.6.1 \(784b254d669919c872a505b807db8462b6140973, Apr 16 2019, 18:18:28\)  
\[PyPy 7.1.1-beta0 with GCC 8.2.0\] on linux

aggdraw==1.3.11  
Pillow==6.1.0

Attached is full log output with PYPYLOG enabled.