https://git.ruby-lang.org/ruby.git/commit/?id=39cf0b5314

From 39cf0b5314c206fee5a331dcccd2d80bda11c417 Mon Sep 17 00:00:00 2001
From: Alan Wu <XrXr@u...>
Date: Mon, 20 Dec 2021 16:13:34 -0500
Subject: Show whether object is garbage in rb_raw_obj_info()

When using `rp(obj)` for debugging during development, it may be
useful to know that an object is soon to be swept. Add a new letter to
the object dump for whether the object is garbage. It's easy to forget
about lazy sweep.
---
 gc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/gc.c b/gc.c
index 936874dabad..5a723762ad9 100644
--- a/gc.c
+++ b/gc.c
@@ -13093,13 +13093,14 @@ rb_raw_obj_info(char *buff, const int buff_size, VALUE obj) https://github.com/ruby/ruby/blob/trunk/gc.c#L13093
 	const int age = RVALUE_FLAGS_AGE(RBASIC(obj)->flags);
 
         if (is_pointer_to_heap(&rb_objspace, (void *)obj)) {
-            APPENDF((BUFF_ARGS, "%p [%d%s%s%s%s%s] %s ",
+            APPENDF((BUFF_ARGS, "%p [%d%s%s%s%s%s%s] %s ",
                      (void *)obj, age,
                      C(RVALUE_UNCOLLECTIBLE_BITMAP(obj),  "L"),
                      C(RVALUE_MARK_BITMAP(obj),           "M"),
                      C(RVALUE_PIN_BITMAP(obj),            "P"),
                      C(RVALUE_MARKING_BITMAP(obj),        "R"),
                      C(RVALUE_WB_UNPROTECTED_BITMAP(obj), "U"),
+                     C(rb_objspace_garbage_object_p(obj), "G"),
                      obj_type_name(obj)));
         }
         else {
-- 
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