merge revision(s) 9682db065158da5fa4ec8a3bc267da45b429b92c: [Backport #17658]

	Remove sender/message_id pair after response received in resolv

	Once a response for a given DNS request has been received (which
	requires a matching message id), the [sender, message_id] pair
	should be removed from the list of valid senders.  This makes it
	so duplicate responses from the same sender are ignored.

	Fixes [Bug #12838]
	---
	 lib/resolv.rb           |   2 +-
	 test/resolv/test_dns.rb | 113 ++++++++++++++++++++++++++++++++++++++++++++++++
	 2 files changed, 114 insertions(+), 1 deletion(-)

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_6@67929 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/resolv.rb b/lib/resolv.rb
index edca92689d..93b57c62d8 100644
--- a/lib/resolv.rb
+++ b/lib/resolv.rb
@@ -701,7 +701,7 @@ class Resolv
       end
 
       def sender_for(addr, msg)
-        @senders[[addr,msg.id]]
+        @senders.delete([addr,msg.id])
       end
 
       def close