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  };
  inline Statement::~Statement() { }

  ////////////////////////
  // Blocks of statements.
  ////////////////////////
  class Block : public Statement, public Vectorized<Statement*> {
    ADD_PROPERTY(bool, is_root);
    // needed for properly formatted CSS emission
    ADD_PROPERTY(bool, has_hoistable);
    ADD_PROPERTY(bool, has_non_hoistable);
  protected:
    void adjust_after_pushing(Statement* s)
    {
      if (s->is_hoistable()) has_hoistable_     = true;
      else                   has_non_hoistable_ = true;
    };
  public:
    Block(string p, size_t l, size_t s = 0, bool r = false)
    : Statement(p, l),
      Vectorized<Statement*>(s),
      is_root_(r), has_hoistable_(false), has_non_hoistable_(false)
    { }
    Block* block() { return this; }
    ATTACH_OPERATIONS();
  };

  ////////////////////////////////////////////////////////////////////////
  // Abstract base class for statements that contain blocks of statements.
  ////////////////////////////////////////////////////////////////////////
  class Has_Block : public Statement {
    ADD_PROPERTY(Block*, block);
  public:
    Has_Block(string p, size_t l, Block* b)
    : Statement(p, l), block_(b)
    { }
    virtual ~Has_Block() = 0;
  };
  inline Has_Block::~Has_Block() { }

  /////////////////////////////////////////////////////////////////////////////
  // Rulesets (i.e., sets of styles headed by a selector and containing a block
  // of style declarations.
  /////////////////////////////////////////////////////////////////////////////
  class Selector;
  class Ruleset : public Has_Block {
    ADD_PROPERTY(Selector*, selector);
  public:
    Ruleset(string p, size_t l, Selector* s, Block* b)
    : Has_Block(p, l, b), selector_(s)
    { }
    // nested rulesets need to be hoisted out of their enclosing blocks
    bool is_hoistable() { return true; }
    ATTACH_OPERATIONS();
  };

  /////////////////////////////////////////////////////////
  // Nested declaration sets (i.e., namespaced properties).
  /////////////////////////////////////////////////////////
  class String;
  class Propset : public Has_Block {
    ADD_PROPERTY(String*, property_fragment);
  public:
    Propset(string p, size_t l, String* pf, Block* b = 0)
    : Has_Block(p, l, b), property_fragment_(pf)
    { }
    ATTACH_OPERATIONS();
  };

  /////////////////
  // Media queries.
  /////////////////
  class List;
  class Media_Block : public Has_Block {
    ADD_PROPERTY(List*, media_queries);
    ADD_PROPERTY(Selector*, enclosing_selector);
  public:
    Media_Block(string p, size_t l, List* mqs, Block* b)
    : Has_Block(p, l, b), media_queries_(mqs), enclosing_selector_(0)
    { }
    bool is_hoistable() { return true; }
    ATTACH_OPERATIONS();
  };

  ///////////////////////////////////////////////////////////////////////
  // At-rules -- arbitrary directives beginning with "@" that may have an
  // optional statement block.
  ///////////////////////////////////////////////////////////////////////
  class At_Rule : public Has_Block {
    ADD_PROPERTY(string, keyword);
    ADD_PROPERTY(Selector*, selector);
  public:
    At_Rule(string p, size_t l, string kwd, Selector* sel = 0, Block* b = 0)
    : Has_Block(p, l, b), keyword_(kwd), selector_(sel)
    { }
    ATTACH_OPERATIONS();
  };

  ////////////////////////////////////////////////////////////////////////
  // Declarations -- style rules consisting of a property name and values.
  ////////////////////////////////////////////////////////////////////////
  class Declaration : public Statement {
    ADD_PROPERTY(String*, property);
    ADD_PROPERTY(Expression*, value);
    ADD_PROPERTY(bool, is_important);
  public:
    Declaration(string p, size_t l,
                String* prop, Expression* val, bool i = false)
    : Statement(p, l), property_(prop), value_(val), is_important_(i)
    { }
    ATTACH_OPERATIONS();
  };

  /////////////////////////////////////
  // Assignments -- variable and value.
  /////////////////////////////////////
  class Variable;
  class Expression;
  class Assignment : public Statement {
    ADD_PROPERTY(string, variable);
    ADD_PROPERTY(Expression*, value);
    ADD_PROPERTY(bool, is_guarded);
  public:
    Assignment(string p, size_t l,