https://git.ruby-lang.org/ruby.git/commit/?id=1eac38c609

From 1eac38c6093a03688c2f046cfb6a16028b9395f5 Mon Sep 17 00:00:00 2001
From: Yusuke Endoh <mame@r...>
Date: Mon, 25 Oct 2021 20:45:05 +0900
Subject: test/ruby/test_rubyvm.rb: prevent "assigned but unused variable"
 warnings

http://rubyci.s3.amazonaws.com/centos7/ruby-master/log/20211025T093004Z.log.html.gz
```
[ 4896/21159] TestRubyVM#test_keep_script_lines(none):3: warning: assigned but unused variable - b
(none):6: warning: assigned but unused variable - c
(none):1: warning: assigned but unused variable - a
<compiled>:3: warning: assigned but unused variable - b
(none):3: warning: assigned but unused variable - b
(none):6: warning: assigned but unused variable - c
(none):1: warning: assigned but unused variable - a
<compiled>:3: warning: assigned but unused variable - b
```
---
 test/ruby/test_rubyvm.rb | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/test/ruby/test_rubyvm.rb b/test/ruby/test_rubyvm.rb
index a6d0b1a7279..7d4588a165c 100644
--- a/test/ruby/test_rubyvm.rb
+++ b/test/ruby/test_rubyvm.rb
@@ -18,12 +18,12 @@ class TestRubyVM < Test::Unit::TestCase https://github.com/ruby/ruby/blob/trunk/test/ruby/test_rubyvm.rb#L18
 
   def parse_and_compile
     script = <<~RUBY
-      a = 1
+      _a = 1
       def foo
-        b = 2
+        _b = 2
       end
       1.times{
-        c = 3
+        _c = 3
       }
     RUBY
 
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