From dff6c6abbc437d32ea49542f9fce282507394e5d Mon Sep 17 00:00:00 2001
From: Shizuo Fujita <fujita@clear-code.com>
Date: Sun, 22 Mar 2026 11:46:43 +0900
Subject: [PATCH] Use Array#rotate! instead

---
 lib/cool.io/dns_resolver.rb | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/cool.io/dns_resolver.rb b/lib/cool.io/dns_resolver.rb
index 7e0774c..0935121 100644
--- a/lib/cool.io/dns_resolver.rb
+++ b/lib/cool.io/dns_resolver.rb
@@ -113,8 +113,7 @@ def on_timeout
 
     # Send a request to the DNS server
     def send_request
-      nameserver = @nameservers.shift
-      @nameservers << nameserver # rotate them
+      @nameservers.rotate!
       begin
         @socket.send request_message, 0, @nameservers.first, DNS_PORT
       rescue Errno::EHOSTUNREACH # TODO figure out why it has to be wrapper here, when the other wrapper should be wrapping this one!