New issue 2522: regression in multiple inheritance
https://bitbucket.org/pypy/pypy/issues/2522/regression-in-multiple-inheritance
mattip:
On PyPy 5.7 a class that inherits from a c-api class and a app-level class
initiates the app-level class tp_new to 0x1. Numpy will call the second
``tp_bases``'s ``tp_new``, which crashes. To reproduce, ``pip install numpy``
then run
```
#!python
import numpy as np
class A(object):
pass
class B(A, np.float64):
pass
class B0(np.float64, A):
pass
class C0(B0):
pass
x = B0(1.0)
```
Reported by Gelin Yan on pypy-dev, then distilled from
``numpy/core/tests/test_scalarinherit.py``
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