https://git.ruby-lang.org/ruby.git/commit/?id=900e0c8c39

From 900e0c8c39fe3df72d7ce451e01c1add7b6f1647 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 14 Dec 2021 00:55:02 +0900
Subject: [ruby/securerandom] Use String#unpack1

https://github.com/ruby/securerandom/commit/5460a18c35
---
 lib/random/formatter.rb            | 2 +-
 test/ruby/test_random_formatter.rb | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/lib/random/formatter.rb b/lib/random/formatter.rb
index d7e7b1f77a1..744853a4b71 100644
--- a/lib/random/formatter.rb
+++ b/lib/random/formatter.rb
@@ -71,7 +71,7 @@ module Random::Formatter https://github.com/ruby/ruby/blob/trunk/lib/random/formatter.rb#L71
   #   prng.hex #=> "eb693ec8252cd630102fd0d0fb7c3485"
   #   prng.hex #=> "91dc3bfb4de5b11d029d376634589b61"
   def hex(n=nil)
-    random_bytes(n).unpack("H*")[0]
+    random_bytes(n).unpack1("H*")
   end
 
   # Random::Formatter#base64 generates a random base64 string.
diff --git a/test/ruby/test_random_formatter.rb b/test/ruby/test_random_formatter.rb
index df3320b41c8..a5072099e1b 100644
--- a/test/ruby/test_random_formatter.rb
+++ b/test/ruby/test_random_formatter.rb
@@ -27,9 +27,9 @@ module Random::Formatter https://github.com/ruby/ruby/blob/trunk/test/ruby/test_random_formatter.rb#L27
     end
 
     def test_base64
-      assert_equal(16, @it.base64.unpack('m*')[0].size)
+      assert_equal(16, @it.base64.unpack1('m*').size)
       17.times do |idx|
-        assert_equal(idx, @it.base64(idx).unpack('m*')[0].size)
+        assert_equal(idx, @it.base64(idx).unpack1('m*').size)
       end
     end
 
-- 
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