Method missing leak

method-missing-leak.rb

#!/usr/bin/env ruby

require 'weakref'

$LEAK = true

class Hidden
  def initialize(cls)
    @cls = cls
  end

  if $LEAK
    def method_missing(meth, *args, &block)
      @cls.public_send(meth, *args, &block)
    end
  else
    def foo
      @cls.foo
    end
  end
end

class Test
  attr_reader :foo

  def initialize(foo)
    @foo = foo
  end
end

test = Hidden.new(Test.new('foo'))
p test.foo
weak = WeakRef.new test
test = nil

puts 'Wait'
tests = []
loop do
  GC.start
  break unless weak.weakref_alive?
  tests << Test.new(nil)
end
puts 'PASS' unless weak.weakref_alive?
sleep 1