https://git.ruby-lang.org/ruby.git/commit/?id=bed6b7206a

From bed6b7206a64eeca5b521e02799da4055d9f5e55 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Tue, 18 Aug 2020 23:32:46 +0900
Subject: test/irb/test_history.rb: prevent warnings

```
/home/chkbuild/chkbuild/tmp/build/20200818T123003Z/ruby/test/irb/test_history.rb:16:
warning: assigned but unused variable - result_output
/home/chkbuild/chkbuild/tmp/build/20200818T123003Z/ruby/test/irb/test_history.rb:34:
warning: assigned but unused variable - result_output
/home/chkbuild/chkbuild/tmp/build/20200818T123003Z/ruby/test/irb/test_history.rb:57:
warning: assigned but unused variable - result_output
/home/chkbuild/chkbuild/tmp/build/20200818T123003Z/ruby/test/irb/test_history.rb:80:
warning: assigned but unused variable - result_output
```

diff --git a/test/irb/test_history.rb b/test/irb/test_history.rb
index 430661c..0b3620f 100644
--- a/test/irb/test_history.rb
+++ b/test/irb/test_history.rb
@@ -13,7 +13,7 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_history.rb#L13
     end
 
     def test_history_save_1
-      result_output, result_history_file = launch_irb_with_irbrc_and_irb_history(<<~IRBRC, <<~IRB_HISTORY) do |stdin|
+      _result_output, result_history_file = launch_irb_with_irbrc_and_irb_history(<<~IRBRC, <<~IRB_HISTORY) do |stdin|
         IRB.conf[:USE_READLINE] = true
         IRB.conf[:SAVE_HISTORY] = 1
       IRBRC
@@ -31,7 +31,7 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_history.rb#L31
     end
 
     def test_history_save_100
-      result_output, result_history_file = launch_irb_with_irbrc_and_irb_history(<<~IRBRC, <<~IRB_HISTORY) do |stdin|
+      _result_output, result_history_file = launch_irb_with_irbrc_and_irb_history(<<~IRBRC, <<~IRB_HISTORY) do |stdin|
         IRB.conf[:USE_READLINE] = true
         IRB.conf[:SAVE_HISTORY] = 100
       IRBRC
@@ -54,7 +54,7 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_history.rb#L54
     end
 
     def test_history_save_bignum
-      result_output, result_history_file = launch_irb_with_irbrc_and_irb_history(<<~IRBRC, <<~IRB_HISTORY) do |stdin|
+      _result_output, result_history_file = launch_irb_with_irbrc_and_irb_history(<<~IRBRC, <<~IRB_HISTORY) do |stdin|
         IRB.conf[:USE_READLINE] = true
         IRB.conf[:SAVE_HISTORY] = 10 ** 19
       IRBRC
@@ -77,7 +77,7 @@ module TestIRB https://github.com/ruby/ruby/blob/trunk/test/irb/test_history.rb#L77
     end
 
     def test_history_save_minus_as_infinity
-      result_output, result_history_file = launch_irb_with_irbrc_and_irb_history(<<~IRBRC, <<~IRB_HISTORY) do |stdin|
+      _result_output, result_history_file = launch_irb_with_irbrc_and_irb_history(<<~IRBRC, <<~IRB_HISTORY) do |stdin|
         IRB.conf[:USE_READLINE] = true
         IRB.conf[:SAVE_HISTORY] = -1 # infinity
       IRBRC
-- 
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