Many places in Sage have
try:
sig_on()
...
finally:
sig_off()
which is wrong (if sig_on() throws an exception, there should be no
sig_off()). This should be replaced by
sig_on()
try:
...
finally:
sig_off()
Most of these are in sage/libs/ppl.pyx and in sage/symbolic/expression.pyx
Trac #15488 does this and it would nice to have a quick review, since it
touches many things and will bitrot quickly. Moreover, I think it should
be an easy review. Needless to say, doctests pass with the patch.
Thanks,
Jeroen.
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