[Truffle] Array#hash error with recursive arrays

[bjfish]

I get the following error when running the following code:
Code:

a = [1, 'two', 3.0]
5.times { a << a }
a
a.hash

Expected (hash value):

170595643093628540

Actual:

core:/core/rubinius/common/array.rb:138:in `initialize':  (Thread::InnerRecursionDetected)
    from core:/core/rubinius/common/array.rb:138:in `raise'
    from core:/core/rubinius/common/array.rb:138:in `hash'
    from core:/core/rubinius/common/array.rb:145:in `block in hash'
    from core:/core/rubinius/common/array.rb:145:in `each'
    from core:/core/rubinius/common/array.rb:145:in `hash'
    from rang.rb:4:in `<main>'

[chrisseaton]

Must be a problem with our recursive_objects stuff - I'm going to take a guess something to do with the exceptions as we don't have much that exercises that.