#include <civlc.h>

void main(){
  $scope s = $here, t = $here;
  $scope p = $scope_parent(s);
  $gcomm g = $gcomm_create(p, 5);
  $gcomm f;
  
  void foo(){
    $scope fs = $here;
    $scope sum = fs + s;// compute the lowest common ancestors of fs and s.
    
    $assert(s > fs);
    $assert(sum == s);
  }
  
  f = g;
  g = f;
  foo();
  $assert(s == t);
  $assert(s != p);
  $assert(s <= p);// s is equal to p or s is strictly a descendant of p.
  $assert(s < p);// s is strictly a descendant of p 
  $assert(p >= s);// p is equal to s or p is strictly an ancestor of s.
  $assert(p > s);// p is strictly a ancestor of s.
}