501
Comment:

500

Deletions are marked like this.  Additions are marked like this. 
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= Segfaults =  = Segfaults = 
Segfaults
sage: R = QQ['x,y'].fraction_field() sage: x,y = R.gens() sage: a = x sage: str(a) sage: P = PolynomialRing(QQ, 2, 'x') sage: x = P.gens() sage: from sage.combinat.misc import umbral_operation sage: a = umbral_operation(x[0]^3) sage: Partition([3,2,1]).arms_legs_coeff(1,1)
Errors
TypeError: sage.structure.parent.Set_generic.__new__(Set_object_enumerated) is not safe, use sage.structure.wrapper_parent.WrapperParent_model1.__new__()