kazu 1eba8ecb66 lib/monitor.rb: prevent to initialize MonitorMixin twice
and allow to initialize again when obj.dup.

Suggested by Benoit Daloze.  [ruby-core:88504] [Feature #15000]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@66215 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
2018-12-05 09:07:54 +00:00
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