The following code causes a crash:

R = BooleanPolynomialRing(2)
f = 1 + R.gens()[0]
s = f.set()
t = set(s)

# this happened on sagenb.org, as well as the latest SAGE version
installed locally.



------------------------------------------------------------
Unhandled SIGSEGV: A segmentation fault occured in SAGE.
This probably occured because a *compiled* component
of SAGE has a bug in it (typically accessing invalid memory)
or is not properly wrapped with _sig_on, _sig_off.
You might want to run SAGE under gdb with 'sage -gdb' to debug this.
SAGE will now terminate (sorry).
------------------------------------------------------------
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