+/* 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);
+void grammar_midrule_action (void);
+void grammar_current_rule_prec_set (symbol *precsym, location loc);
+void grammar_current_rule_dprec_set (int dprec, location loc);
+void grammar_current_rule_merge_set (uniqstr name, location loc);