/* From reader.c. */
void grammar_start_symbol_set (symbol *sym, location loc);
void prologue_augment (const char *prologue, location loc);
-void epilogue_augment (const char *epilogue, location loc);
void grammar_symbol_append (symbol *sym, location loc);
void grammar_rule_begin (symbol *lhs, location loc);
void grammar_rule_end (location loc);