New issue 2137: Infinite recursion with __coerce__
https://bitbucket.org/pypy/pypy/issues/2137/infinite-recursion-with-__coerce__
Anders Kaseorg:
This leads to infinite recursion (`RuntimeError: maximum recursion depth
exceeded`) in PyPy 2.6.0 but not CPython 2.7.10:
```
#!python
class C:
def __coerce__(self, other):
print 'coerce'
return C(), C()
def __add__(self, other):
return C()
C() + C()
```
CPython only calls `__coerce__` once.
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