[Apologies for earlier pinging the wrong "Monnier" account on GitHub. :) Oops.]

@monnier As reported starting at this comment, the Pcase-related change in emacs.git commit 16fc5b6c0c72464a75d9a84b754375662b3acec6 has caused a breakage in Org QL: now trying to run some queries (which are parsed and optimized using Pcase expressions) signals a "Please avoid it" error.

The code in question works fine on master before that commit, and on earlier versions of Emacs.

Is this a bug in that commit, or is it now exposing a bug in downstream software?

Thanks.

(Backtrace is in an attachment because GitHub won't accept it in this form.)
backtrace.txt