class Staff_performer;
class Stencil;
class Stream_event;
-class Swallow_engraver;
-class Swallow_performer;
class System;
class Tempo_performer;
class Tie;
class Translator_change;
class Translator_group;
class Transposed_music;
-class Type_swallow_translator;
class yyFlexLexer;
typedef void (*Engraver_void_function_engraver_grob_info) (Engraver *, Grob_info);