https://git.ruby-lang.org/ruby.git/commit/?id=c355fa72d4

From c355fa72d4e356378a8b03a67432b52bafcc308b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Mon, 10 Aug 2020 16:54:09 +0900
Subject: Suppress unused-function warnings

Calls with a constant argument should be optimized away.

diff --git a/array.c b/array.c
index 1f8781b..ce194d9 100644
--- a/array.c
+++ b/array.c
@@ -8948,6 +8948,11 @@ rb_ary_deconstruct(VALUE ary) https://github.com/ruby/ruby/blob/trunk/array.c#L8948
 void
 Init_Array(void)
 {
+    if (should_be_T_ARRAY(Qnil)) {
+        should_not_be_shared_and_embedded(Qnil);
+        UNREACHABLE;
+    }
+
 #undef rb_intern
 #define rb_intern(str) rb_intern_const(str)
 
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