load foreigner only when defined.
load foreigner only when defined.

procore/closure_tree,froderik/closure_tree,mceachen/closure_tree,seuros/closure_tree,fabien-michel/closure_tree,procore/closure_tree,froderik/closure_tree,fabien-michel/closure_tree,fabien-michel/closure_tree,seuros/closure_tree,seuros/closure_tree,froderik/closure_tree,mceachen/closure_tree,procore/closure_tree,mceachen/closure_tree