public I18nCheckedTree apply(SpaceCollapsedTree tree, PlaceholderPivotedTree pivotedTree) {
AlertSetBuilder alertSetBuilder = new AlertSetBuilder(pivotedTree.getAlerts());
tree.getRoot().acceptVisitor(new Visitor(alertSetBuilder));
return new I18nCheckedTree(pivotedTree.getSourcePosition(),
alertSetBuilder.buildAndClear(),
pivotedTree.getRoot());
}
/**
* Visits a space collapsed tree and generates