inside of :meth:`.Insert.from_select`. This behavior worked
accidentally up until 0.9.9, when it no longer worked due to
unrelated changes as part of 🎫`3248`. Note that this
is the rendering of the WITH clause after the INSERT, before the
SELECT; the full functionality of CTEs rendered at the top
level of INSERT, UPDATE, DELETE is a new feature targeted for a
later release.
fixes#3418
Mike Bayer
eb1bb84fbc