<div id="comment:0"></div> in particular using iterators inside and the default argument CC: @tscrim @slel @kwankyu @kliem Component: **combinatorics** Author: **Frédéric Chapoton** Branch/Commit: **[`6044f16`](https://github.com/sagemath/sagetrac-mirror/commit/6044f164942dd17f7f1a26949b128c581ed238a4)** Reviewer: **Travis Scrimshaw** _Issue created by migration from https://trac.sagemath.org/ticket/34898_