pit_type prev = pit > 0 ? depthHook(pit, par.getDepth()) : pit;
if (prev < pit && cur.pos() == par.beginOfBody()
&& !par.size() && !par.isEnvSeparator(cur.pos())
+ && !par.layout().keepempty
&& !par.layout().isCommand()
&& pars_[prev].layout() != par.layout()
&& pars_[prev].layout().isEnvironment()