[Haskell-cafe] how to check thunk

[山本和彦]

Hello,

Are there any ways to see if a value is a thunk or memorized?
I would like to have a function like:
  isThunk :: a -> IO Bool

I'm implementing some data structures described in "Purely Functional
Data Structures" and want to check my implementation is correct.
E.g.

        https://gist.github.com/2987425

Thanks.

--Kazu

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