https://git.ruby-lang.org/ruby.git/commit/?id=14ba62d488

From 14ba62d4881061a1d54b6204b0c4f0b4811ac921 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: Tue, 24 Sep 2019 11:44:41 +0900
Subject: refactor delete unused variable

cadfaacb2533d47d52dbb5dbefe724d7bf11112e missed it.

diff --git a/vm.c b/vm.c
index 70f9602..b76f920 100644
--- a/vm.c
+++ b/vm.c
@@ -3227,13 +3227,12 @@ Init_VM(void) https://github.com/ruby/ruby/blob/trunk/vm.c#L3227
 	rb_thread_t *th = GET_THREAD();
 	VALUE filename = rb_fstring_lit("<main>");
 	const rb_iseq_t *iseq = rb_iseq_new(0, filename, filename, Qnil, 0, ISEQ_TYPE_TOP);
-        volatile VALUE th_self;
 
 	/* create vm object */
 	vm->self = TypedData_Wrap_Struct(rb_cRubyVM, &vm_data_type, vm);
 
 	/* create main thread */
-	th_self = th->self = TypedData_Wrap_Struct(rb_cThread, &thread_data_type, th);
+        th->self = TypedData_Wrap_Struct(rb_cThread, &thread_data_type, th);
 	vm->main_thread = th;
 	vm->running_thread = th;
 	th->vm = vm;
-- 
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