https://git.ruby-lang.org/ruby.git/commit/?id=c8dc2bf140

From c8dc2bf1401fc01d35a4a7587ed224f1f2fe29e6 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: Wed, 24 Jun 2020 16:19:55 +0900
Subject: RBIMPL_UNREACHABLE_RETURN: evaluate the argument

Prevent casual typos inside of UNREACHABLE_RETURN(...).

diff --git a/include/ruby/internal/assume.h b/include/ruby/internal/assume.h
index e95b2fb..5af1c3c 100644
--- a/include/ruby/internal/assume.h
+++ b/include/ruby/internal/assume.h
@@ -42,7 +42,7 @@ https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/assume.h#L42
 
 /** Wraps (or simulates) `__builtin_unreachable`. */
 #if RBIMPL_HAS_BUILTIN(__builtin_unreachable)
-# define RBIMPL_UNREACHABLE_RETURN(_) __builtin_unreachable()
+# define RBIMPL_UNREACHABLE_RETURN(_) (__builtin_unreachable(), (_))
 
 #elif defined(RBIMPL_HAVE___ASSUME)
 # define RBIMPL_UNREACHABLE_RETURN(_) return (__assume(0), (_))
-- 
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