rb_sym_immortal_count  279 ext/objspace/objspace.c size_t rb_sym_immortal_count(void);
rb_sym_immortal_count  313 ext/objspace/objspace.c     size_t immortal_symbols = rb_sym_immortal_count();
rb_sym_immortal_count  105 symbol.h       size_t rb_sym_immortal_count(void);