public VisitorExpression clone() {
final VisitorExpression e = new VisitorExpression(t.clone(), body.clone());
copyFieldsTo(e);
return e;
}
public VisitorExpression(final VisitorType t, final Block body) {
if (t != null) t.setParent(this);
if (body != null) body.setParent(this);
this.t = t;
this.body = body;
}