New issue 2781: memory leak in pypy default branch as of 20180401
https://bitbucket.org/pypy/pypy/issues/2781/memory-leak-in-pypy-default-branch-as-of
pv:
The following seems to leak memory on current pypy default branch
(045483a22d66):
```
# pypy -mensurepip
# pypy -mpip install numpy==1.14.2
# pypy runthis.py
# -> memory usage increases, without upper bound
import numpy as np
x = np.zeros([1])
while True:
x - x
```
The memory usage seems to grow without upper bound. This does not occur on
pypy-5.10.0, for which the memory usage stays constant. The issue is also
visible in current py3.5 branch.
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