New issue 1772: Complex dtype unhashable.
https://bitbucket.org/pypy/pypy/issue/1772/complex-dtype-unhashable
Yichao Yu:
In pypy,
```
pypy -c 'import numpy as np; t = np.dtype([("s1", np.int8), ("s2", np.int8)]);
print(hash(t))'
Traceback (most recent call last):
File "app_main.py", line 75, in run_toplevel
File "app_main.py", line 581, in run_it
File "<string>", line 1, in <module>
TypeError: 'dict' objects are unhashable
```
In CPython
```
python2 -c 'import numpy as np; t = np.dtype([("s1", np.int8), ("s2",
np.int8)]); print(hash(t))'
-5634517127405799957
```
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