On 2017-06-18 14:05, Ximin Luo wrote: > If I understand correctly, this is the cleaner solution to the problem described in #22442. No, it is unrelated to that as far as I can tell. It is needed for CyPari2, see https://trac.sagemath.org/ticket/20238 The patch was added on https://trac.sagemath.org/ticket/22728