Do not apply `mrb_ptr()` to immediate objects; fix
MODIFY
src/object.c
src/object.c
@@ -434,8 +434,10 @@ mrb_any_to_s(mrb_state *mrb, mrb_value obj)
mrb_str_cat_lit(mrb, str, "#<");
mrb_str_cat_cstr(mrb, str, cname);
+ if (!mrb_immediate_p(obj)) {
mrb_str_cat_lit(mrb, str, ":");
mrb_str_concat(mrb, str, mrb_ptr_to_str(mrb, mrb_ptr(obj)));
+ }
mrb_str_cat_lit(mrb, str, ">");
return str;

Do not apply `mrb_ptr()` to immediate objects; fix #4307