<div id="comment:0"></div> fixing one lgtm warning about `QQ[[var]]` CC: @tscrim @slel @kwankyu @kliem @mantepse Component: **modular forms** Author: **Frédéric Chapoton** Branch/Commit: **[`9080ed5`](https://github.com/sagemath/sagetrac-mirror/commit/9080ed5a295e04d273d165be689eebdef8578a10)** Reviewer: **Travis Scrimshaw** _Issue created by migration from https://trac.sagemath.org/ticket/34667_