Maintenance Ruby 3.3 gets fixes, but no new features. Switch to Ruby 4.0 →
instance method
Singleton#dup
dup
lib/singleton.rb
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# File tmp/rubies/ruby-3.3.0/lib/singleton.rb, line 103
def dup
raise TypeError, "can't dup instance of singleton #{self.class}"
end
Raises a TypeError to prevent duping.