The answer is very obvious: the OverflowError is raised *inside* the
sig_on/sig_off block.
The general solution would be
sig_on()
try:
mpz_bin_ui(x.value, aa.value, b)
finally:
sig_off()
but in this case you can simply move the conversion:
cdef unsigned long b0 = b # <-- OverflowError possible here
sig_on()
mpz_bin_ui(x.value, aa.value, b0) # <-- No more OverflowError
sig_off()
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