https://git.ruby-lang.org/ruby.git/commit/?id=0d632a956c

From 0d632a956cc4a58457d78f884ff62ca8605056e2 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 29 Jul 2020 21:08:48 +0900
Subject: transient_heap_status_cstr() is used only for debugging


diff --git a/transient_heap.c b/transient_heap.c
index c626f8d..aa0d8de 100644
--- a/transient_heap.c
+++ b/transient_heap.c
@@ -732,6 +732,7 @@ transient_heap_block_evacuate(struct transient_heap* theap, struct transient_hea https://github.com/ruby/ruby/blob/trunk/transient_heap.c#L732
     }
 }
 
+#if USE_RUBY_DEBUG_LOG
 static const char *
 transient_heap_status_cstr(enum transient_heap_status status)
 {
@@ -740,8 +741,9 @@ transient_heap_status_cstr(enum transient_heap_status status) https://github.com/ruby/ruby/blob/trunk/transient_heap.c#L741
       case transient_heap_marking: return "marking";
       case transient_heap_escaping: return "escaping";
     }
-    return NULL; // unreachable;
+    UNREACHABLE_RETURN(NULL);
 }
+#endif
 
 static void
 transient_heap_update_status(struct transient_heap* theap, enum transient_heap_status status)
-- 
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