For ACL2(p): enable waterfall-parallelism hacks
General Forms: (set-waterfall-parallelism-hacks-enabled t) (set-waterfall-parallelism-hacks-enabled nil)
Some features (e.g., override-hints and clause-processors) of
serial ACL2 are by default not available in ACL2(p) with waterfall parallelism
enabled, because they offer a mechanism to modify state that is
unsound. To allow or (once again) disallow the use the these features in
See error-triples-and-parallelism for further related discussion.