https://git.ruby-lang.org/ruby.git/commit/?id=df3de40932

From df3de409325d1e95d375a736d2bc9c45d47ec317 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 30 Apr 2019 22:13:47 +0900
Subject: String#[] with index to extract matched substring safely


diff --git a/tool/merger.rb b/tool/merger.rb
index 755e55c..025a559 100755
--- a/tool/merger.rb
+++ b/tool/merger.rb
@@ -316,7 +316,7 @@ else https://github.com/ruby/ruby/blob/trunk/tool/merger.rb#L316
       end
       patch = resp.body
 
-      message = "\n\n#{(patch.match(/^Subject: (.*)\n\ndiff --git/m)&.[](1) || "Message not found for revision: #{git_rev}\n")}"
+      message = "\n\n#{(patch[/^Subject: (.*)\n\ndiff --git/m, 1] || "Message not found for revision: #{git_rev}\n")}"
       puts '+ git apply'
       IO.popen(['git', 'apply'], 'w') { |f| f.write(patch) }
     else
-- 
cgit v0.10.2


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