The following code crashes (in Sage 8.1 and on CoCalc):
sage: K=CyclotomicField(20)
sage: R.<x>=PolynomialRing(K)
sage: (x^4-1).factor()
---------------------------------------------------------------------------
PariError Traceback (most recent call last)
<ipython-input-3-12edfe8f4001> in <module>()
----> 1 (x**Integer(4)-Integer(1)).factor()
/ext/sage/sage-8.1/src/sage/rings/polynomial/polynomial_element.pyx in
sage.rings.polynomial.polynomial_element.Polynomial.factor
(build/cythonized/sage/rings/polynomi
al/polynomial_element.c:39428)()
4127 # polynomial instead.
4128 Rpari = R.pari_polynomial("y")
-> 4129 G = list(Rpari.nffactor(f))
4130
# PARI's nffactor() ignores the unit, _factor_pari_helper()
4131 # adds back the unit of the factorization.
cypari2/auto_gen.pxi in cypari2.gen.Gen_auto.nffactor()
cypari2/handle_error.pyx in cypari2.handle_error._pari_err_handle()
PariError: inconsistent concatenation t_VEC (2 elts) , t_COL (2 elts)
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