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 | // Empty
hull();
// No children
hull() { }
hull() {
  cylinder(r=10, h=1);
  translate([0,0,10]) cube([5,5,5], center=true);
}
translate([25,0,0]) hull() {
  translate([0,0,10]) cylinder(r=3);
  difference() {
    cylinder(r=10, h=4, center=true);
    cylinder(r=5, h=5, center=true);
  }
}
// Don't Crash (issue 188)
translate([-5,-5,-5]) {
  hull() {
    intersection() {
      cube([1,1,1]);
      translate([-1,-1,-1]) cube([1,1,1]);
    }
  }
}
 |