[issue29816] Get rid of C limitation for shift count in right shift

[STINNER Victor]

STINNER Victor added the comment:

> I think an OverflowError is appropriate here for denoting the platform and implementation limitation.

It's common that integer overflow on memory allocation in C code raises a MemoryError, not an OverflowError.

>>> "x" * (2**60)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
MemoryError

I suggest to raise a MemoryError.

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<http://bugs.python.org/issue29816>
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