pass-by-ref-challenge.rb

def foo(bar)
  # CHALLENGE: write the body of this method such that
  # when it is invoked, the second call to 'puts' below
  # prints something different that the first call to 'puts'.
  # Getting hold of the Ruby bindings object or reflecting
  # over local variables is cheating and would not demonstrate
  # pass-by-reference.
end

class A; 
end

object = A.new
puts object

foo(object)

puts object