public override RequiresPlain VisitRequiresPlain(RequiresPlain plain)
{
if (plain == null) return null;
return base.VisitRequiresPlain((RequiresPlain)plain.Clone());
}
public override RequiresPlain VisitRequiresPlain(RequiresPlain plain)
{
if (plain == null) return null;
var dup = (RequiresPlain)this.DuplicateFor[plain.UniqueKey];
if (dup != null) return dup;
this.DuplicateFor[plain.UniqueKey] = dup = (RequiresPlain)plain.Clone();
var result = base.VisitRequiresPlain(dup);
return result;
}