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    cerr << endl;
    if (root_block->block()) for(auto i : root_block->block()->elements()) { debug_ast(i, ind + " ", env); }
  } else if (dynamic_cast<Selector_List*>(node)) {
    Selector_List* selector = dynamic_cast<Selector_List*>(node);
    cerr << ind << "Selector_List " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " [block:" << selector->last_block() << "]";
    cerr << (selector->last_block() && selector->last_block()->is_root() ? " [root]" : "");
    cerr << " [@media:" << selector->media_block() << "]";
    cerr << (selector->is_optional() ? " [is_optional]": " -");
    cerr << (selector->has_line_break() ? " [line-break]": " -");
    cerr << (selector->has_line_feed() ? " [line-feed]": " -");
    cerr << endl;

    for(auto i : selector->elements()) { debug_ast(i, ind + " ", env); }

//  } else if (dynamic_cast<Expression*>(node)) {
//    Expression* expression = dynamic_cast<Expression*>(node);
//    cerr << ind << "Expression " << expression << " " << expression->concrete_type() << endl;

  } else if (dynamic_cast<Parent_Selector*>(node)) {
    Parent_Selector* selector = dynamic_cast<Parent_Selector*>(node);
    cerr << ind << "Parent_Selector " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " <" << prettyprint(selector->pstate().token.ws_before()) << ">" << endl;
    debug_ast(selector->selector(), ind + "->", env);

  } else if (dynamic_cast<Complex_Selector*>(node)) {
    Complex_Selector* selector = dynamic_cast<Complex_Selector*>(node);
    cerr << ind << "Complex_Selector " << selector
      << " (" << pstate_source_position(node) << ")"
      << " [block:" << selector->last_block() << "]"
      << " [weight:" << longToHex(selector->specificity()) << "]"
      << (selector->last_block() && selector->last_block()->is_root() ? " [root]" : "")
      << " [@media:" << selector->media_block() << "]"
      << (selector->is_optional() ? " [is_optional]": " -")
      << (selector->has_line_break() ? " [line-break]": " -")
      << (selector->has_line_feed() ? " [line-feed]": " -") << " -> ";
      switch (selector->combinator()) {
        case Complex_Selector::PARENT_OF:   cerr << "{>}"; break;
        case Complex_Selector::PRECEDES:    cerr << "{~}"; break;
        case Complex_Selector::ADJACENT_TO: cerr << "{+}"; break;
        case Complex_Selector::ANCESTOR_OF: cerr << "{ }"; break;
      }
    cerr << " <" << prettyprint(selector->pstate().token.ws_before()) << ">" << endl;
    debug_ast(selector->head(), ind + " ", env);
    debug_ast(selector->tail(), ind + "-", env);
  } else if (dynamic_cast<Compound_Selector*>(node)) {
    Compound_Selector* selector = dynamic_cast<Compound_Selector*>(node);
    cerr << ind << "Compound_Selector " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " [block:" << selector->last_block() << "]";
    cerr << " [weight:" << longToHex(selector->specificity()) << "]";
    // cerr << (selector->last_block() && selector->last_block()->is_root() ? " [root]" : "");
    cerr << " [@media:" << selector->media_block() << "]";
    cerr << (selector->is_optional() ? " [is_optional]": " -");
    cerr << (selector->has_line_break() ? " [line-break]": " -");
    cerr << (selector->has_line_feed() ? " [line-feed]": " -");
    cerr << " <" << prettyprint(selector->pstate().token.ws_before()) << ">" << endl;
    for(auto i : selector->elements()) { debug_ast(i, ind + " ", env); }
  } else if (dynamic_cast<Propset*>(node)) {
    Propset* selector = dynamic_cast<Propset*>(node);
    cerr << ind << "Propset " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " " << selector->tabs() << endl;
    if (selector->block()) for(auto i : selector->block()->elements()) { debug_ast(i, ind + " ", env); }
  } else if (dynamic_cast<Wrapped_Selector*>(node)) {
    Wrapped_Selector* selector = dynamic_cast<Wrapped_Selector*>(node);
    cerr << ind << "Wrapped_Selector " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " <<" << selector->name() << ">>" << (selector->has_line_break() ? " [line-break]": " -") << (selector->has_line_feed() ? " [line-feed]": " -") << endl;
    debug_ast(selector->selector(), ind + " () ", env);
  } else if (dynamic_cast<Pseudo_Selector*>(node)) {
    Pseudo_Selector* selector = dynamic_cast<Pseudo_Selector*>(node);
    cerr << ind << "Pseudo_Selector " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " <<" << selector->name() << ">>" << (selector->has_line_break() ? " [line-break]": " -") << (selector->has_line_feed() ? " [line-feed]": " -") << endl;
    debug_ast(selector->expression(), ind + " <= ", env);
  } else if (dynamic_cast<Attribute_Selector*>(node)) {
    Attribute_Selector* selector = dynamic_cast<Attribute_Selector*>(node);
    cerr << ind << "Attribute_Selector " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " <<" << selector->name() << ">>" << (selector->has_line_break() ? " [line-break]": " -") << (selector->has_line_feed() ? " [line-feed]": " -") << endl;
    debug_ast(selector->value(), ind + "[" + selector->matcher() + "] ", env);
  } else if (dynamic_cast<Selector_Qualifier*>(node)) {
    Selector_Qualifier* selector = dynamic_cast<Selector_Qualifier*>(node);
    cerr << ind << "Selector_Qualifier " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " <<" << selector->name() << ">>" << (selector->has_line_break() ? " [line-break]": " -") << (selector->has_line_feed() ? " [line-feed]": " -") << endl;
  } else if (dynamic_cast<Type_Selector*>(node)) {
    Type_Selector* selector = dynamic_cast<Type_Selector*>(node);
    cerr << ind << "Type_Selector " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " <<" << selector->name() << ">>" << (selector->has_line_break() ? " [line-break]": " -") <<
      " <" << prettyprint(selector->pstate().token.ws_before()) << ">" << endl;
  } else if (dynamic_cast<Selector_Placeholder*>(node)) {

    Selector_Placeholder* selector = dynamic_cast<Selector_Placeholder*>(node);
    cerr << ind << "Selector_Placeholder [" << selector->name() << "] " << selector
      << " [block:" << selector->last_block() << "]"
      << " [@media:" << selector->media_block() << "]"
      << (selector->is_optional() ? " [is_optional]": " -")
      << (selector->has_line_break() ? " [line-break]": " -")
      << (selector->has_line_feed() ? " [line-feed]": " -")
    << endl;

  } else if (dynamic_cast<Selector_Reference*>(node)) {
    Selector_Reference* selector = dynamic_cast<Selector_Reference*>(node);
    cerr << ind << "Selector_Reference " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " @ref " << selector->selector() << endl;
  } else if (dynamic_cast<Simple_Selector*>(node)) {
    Simple_Selector* selector = dynamic_cast<Simple_Selector*>(node);
    cerr << ind << "Simple_Selector " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << (selector->has_line_break() ? " [line-break]": " -") << (selector->has_line_feed() ? " [line-feed]": " -") << endl;

  } else if (dynamic_cast<Selector_Schema*>(node)) {
    Selector_Schema* selector = dynamic_cast<Selector_Schema*>(node);
    cerr << ind << "Selector_Schema " << selector;
    cerr << " (" << pstate_source_position(node) << ")";
    cerr << " [block:" << selector->last_block() << "]"
      << (selector->last_block() && selector->last_block()->is_root() ? " [root]" : "")