[Haskell-cafe] How to check object's identity?

Hi, I tried this in ghci:

Prelude> 1:2:[] == 1:2:[] True

Does this mean (:) return the same object on same input, or (==) is not for identity checking? If the later is true, how can I check two object is the *same* object? Thanks Jan -- jan=callcc{|jan|jan};jan.call(jan)