cython

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# mode: run
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# ticket: t5356
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cimport cython
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@cython.overflowcheck(True)
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cdef size_t _mul_checked(size_t a, size_t b) except? -1:
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    return a * b
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def f(unsigned char[:] a, unsigned char[:] b):
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    """
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    >>> f(memoryview(bytearray(b"12")), memoryview(bytearray(b"345")))
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    6
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    """
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    return _mul_checked(a.shape[0], b.shape[0])
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