https://git.ruby-lang.org/ruby.git/commit/?id=7586355423

From 75863554233a40f74d40138b7a88f07c010281a1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Thu, 13 Feb 2020 15:10:16 +0900
Subject: comma at the end of enum is a C++11ism

Comma at the end of enum is allowed in C since C99. We can use them
internally.  However when it comes to extension libraries, they could be
written in different C++ versions.  We cannot assume sometihng.  Public
headers shall keep compatibilities.

diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 8ff0e97..a97f87f 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -871,7 +871,7 @@ VALUE rb_obj_reveal(VALUE obj, VALUE klass); /* do not use this API to change kl https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L871
 
 #define RVALUE_EMBED_LEN_MAX RVALUE_EMBED_LEN_MAX
 enum ruby_rvalue_flags {
-    RVALUE_EMBED_LEN_MAX = 3,
+    RVALUE_EMBED_LEN_MAX = 3
 };
 
 #define ROBJECT_EMBED_LEN_MAX ROBJECT_EMBED_LEN_MAX
-- 
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