https://git.ruby-lang.org/ruby.git/commit/?id=144b11e03e

From 144b11e03ee0994cacd3fa5eb9ff8b87bd627452 Mon Sep 17 00:00:00 2001
From: Kazuhiro NISHIYAMA <zn@m...>
Date: Sat, 19 Dec 2020 15:24:09 +0900
Subject: Fix `warning: instance variable @head not initialized` and remove
 unused instance variable


diff --git a/sample/list.rb b/sample/list.rb
index b4d1d65..7458ba0 100644
--- a/sample/list.rb
+++ b/sample/list.rb
@@ -5,7 +5,6 @@ class MyElem https://github.com/ruby/ruby/blob/trunk/sample/list.rb#L5
     # @variables are instance variable, no declaration needed
     @data = item
     @succ = nil
-    @head = nil
   end
 
   def data
@@ -23,6 +22,10 @@ class MyElem https://github.com/ruby/ruby/blob/trunk/sample/list.rb#L22
 end
 
 class MyList
+  def initialize
+    @head = nil
+  end
+
   def add_to_list(obj)
     elt = MyElem.new(obj)
     if @head
-- 
cgit v0.10.2


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