Static analyser cppcheck says:
polly/include/polly/ScheduleTreeTransform.h:52:7: style: Statements following 'return' will never be executed. [unreachableCode]
Source code is
case isl_schedule_node_set:
return getDerived().visitSet(Node.as<isl::schedule_node_set>(),
std::forward<Args>(args)...);
assert(isl_schedule_node_n_children(Node.get()) >= 2);