https://git.ruby-lang.org/ruby.git/commit/?id=da22e43ce0

From da22e43ce07040c71bf7ea3aff75b86aae60e7e5 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Thu, 28 Oct 2021 08:23:18 +0900
Subject: Fix a warning

```
../gc.c:2342:25: warning: array subscript is of type 'char' [-Wchar-subscripts]
    GC_ASSERT(size_pools[pool_id].slot_size == slot_size);
                        ^~~~~~~~
```
---
 gc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/gc.c b/gc.c
index bd3915fb470..b5d5df692b6 100644
--- a/gc.c
+++ b/gc.c
@@ -2331,7 +2331,7 @@ rb_gc_obj_slot_size(VALUE obj) https://github.com/ruby/ruby/blob/trunk/gc.c#L2331
 }
 
 static inline size_t
-size_pool_slot_size(char pool_id)
+size_pool_slot_size(unsigned char pool_id)
 {
     GC_ASSERT(pool_id < SIZE_POOL_COUNT);
 
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