https://git.ruby-lang.org/ruby.git/commit/?id=f7dc4d5cda

From f7dc4d5cda74e101fa66c1170c0b47deea09c0ee Mon Sep 17 00:00:00 2001
From: Kenta Murata <mrkn@m...>
Date: Tue, 12 Jan 2021 09:56:58 +0900
Subject: tool/sync_default_gems.rb: Prevent infinite loop due to unknown
 options


diff --git a/tool/sync_default_gems.rb b/tool/sync_default_gems.rb
index 1fed998..4f80db8 100644
--- a/tool/sync_default_gems.rb
+++ b/tool/sync_default_gems.rb
@@ -536,6 +536,9 @@ else https://github.com/ruby/ruby/blob/trunk/tool/sync_default_gems.rb#L536
     when "-a"
       auto = true
       ARGV.shift
+    else
+      $stderr.puts "Unknown command line option: #{ARGV[0]}"
+      exit 1
     end
   end
   gem = ARGV.shift
-- 
cgit v0.10.2


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