gistfile1.rb

$ cat test/test_enumerator.rb

def create_fib()
 Enumerator.new { |y|
    a = b = 1
    loop {
      y << a
      a, b = b, a + b
    }
  }
end

def run_fib(i)
  fib = create_fib
  fib.take i
end

def main
  p "not created enumerator yet"
  p run_fib 10
  p "enumerator should be eligible for GC"
end

main

$ ./bin/jruby --1.9  test/test_enumerator.rb
"not created enumerator yet"
test/test_enumerator.rb:2:in `create_fib': wrong # of arguments(0 for 1) (ArgumentError)
	from test/test_enumerator.rb:12:in `run_fib'
	from test/test_enumerator.rb:18:in `main'
	from test/test_enumerator.rb:22