https://git.ruby-lang.org/ruby.git/commit/?id=751a9b32e5

From 751a9b32e5a53336768eb878de1827245a3292bf Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Mon, 9 Dec 2019 12:30:00 +0900
Subject: vm_args.c (rb_warn_check): Use unique_id * 2 instead of unique_id

The function assumed that the LSB of `callee` was 0.

diff --git a/vm_args.c b/vm_args.c
index 4182452..c6c1118 100644
--- a/vm_args.c
+++ b/vm_args.c
@@ -597,7 +597,7 @@ static VALUE rb_warn_check(const rb_execution_context_t * const ec, const rb_ise https://github.com/ruby/ruby/blob/trunk/vm_args.c#L597
 {
     if (!iseq) return 0;
 
-    const void *const callee = (void *)iseq->body->iseq_unique_id;
+    const void *const callee = (void *)(iseq->body->iseq_unique_id * 2);
 
     const rb_control_frame_t * const cfp = rb_vm_get_ruby_level_next_cfp(ec, ec->cfp);
 
-- 
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