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