Unhashable functions throw error when pickled

[ghost]

cloudpickle/cloudpickle/cloudpickle.py

Line 340 in abeb3fb

if obj in _BUILTIN_TYPE_CONSTRUCTORS:

>>> import cloudpickle
>>> dct = {'a': 1}
>>> getter = dct.get
>>> cloudpickle.dumps(getter)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.6/site-packages/cloudpickle/cloudpickle.py", line 873, in dumps
    cp.dump(obj)
  File "/usr/local/lib/python3.6/site-packages/cloudpickle/cloudpickle.py", line 268, in dump
    return Pickler.dump(self, obj)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/pickle.py", line 409, in dump
    self.save(obj)
  File "/usr/local/Cellar/python3/3.6.3/Frameworks/Python.framework/Versions/3.6/lib/python3.6/pickle.py", line 476, in save
    f(self, obj) # Call unbound method with explicit self
  File "/usr/local/lib/python3.6/site-packages/cloudpickle/cloudpickle.py", line 621, in save_builtin_function
    return self.save_function(obj)
  File "/usr/local/lib/python3.6/site-packages/cloudpickle/cloudpickle.py", line 340, in save_function
    if obj in _BUILTIN_TYPE_CONSTRUCTORS:
TypeError: unhashable type: 'dict'

Functions cannot be hashed if their closure contains unhashable objects.

Line 340 needs to be wrapped in a try/except block.

[ogrisel]

@kelvyang thanks for the bug report. Would you like to submit a pull request with a non-regression test + the fix you suggest?

[ghost]

@ogrisel unfortunately I can't contribute before acquiring approval from my company. Doing that would require some time, it may be faster for someone else to fix it.

[jakirkham]

Looks like a dup of the now resolved issue ( #144 ). Could you please retest with master?

[ghost]

Works now, thanks!