This is @dfrumin's !383 (closed) (with authorship preserved) + some tweaks to setoid rewriting:
Proper
instances can be proven before set_bind_ext
via set_solver
.set_bind_ext
is then provable by set_solver directly.I originally sent dfrumin/coq-stdpp!1 (closed) to be added into !383 (closed), but maybe it's easier with this MR? @robbertkrebbers up to you.