Working with a subclass of Set, JRuby throws a warning from #initialize - minimal reproduction:

require 'set'
class ASet < Set
  def initialize(&block)
    super()
    block[]
  end
end
ASet.new { }

test.rb:4: warning: given block not used. Doesn't seem to happen with a different superclass or method other than #initialize.

Environment Information

• jruby 9.4.12.0
• macos & ubuntu