public Tree mkRef(int pos, Type stable, Symbol symbol) { Tree qualifier = mkQualifier(pos, stable); if (qualifier == Tree.Empty) return Ident(pos, symbol); return mkRef(pos, qualifier, symbol);
public Tree mkRef(int pos, Tree qualifier, Symbol symbol) { return Select(pos, qualifier, symbol);
    public Tree mkRef(int pos, Type stable, Symbol symbol) {        Tree qualifier = mkQualifier(pos, stable);        if (qualifier == Tree.Empty) return Ident(pos, symbol);        return mkRef(pos, qualifier, symbol);    }