coq-bugs.md

@@ -37,3 +37,4 @@ Priority [HIGH] means that this actively affects how we do things and we have no
 * 8.16: [reversible coercions](https://mattermost.mpi-sws.org/iris/pl/yz8o9mc7apfupy7h7e3h17kqxc), see [draft MR](https://gitlab.mpi-sws.org/iris/iris/-/merge_requests/972)
 * 8.17: [future coercion syntax](https://github.com/coq/coq/pull/16230)
 * 8.19: [`resolve_tc`](https://github.com/coq/coq/pull/13071)
+* 8.20: [Smarter guard condition](https://github.com/coq/coq/pull/17986) should allow us to define `fmap`/`mbind` instances for `list` that can be used in nested recursion and do not require the `csimpl` hack.
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