[Haskell-cafe] IORefs and weak pointers

Hello all, I wanted to create a weak pointer with an IORef as the key and something else as the value, but I saw no way to do it through the API provided. After some experimentation I came up with the following abomination for a solution: myWeakRef (IORef (STRef r)) v f = IO $ \s -> case mkWeak# r v f s of (# s', w #) -> (# s', Weak w #) This works perfectly when the code is compiled both with and without optimisations, but ghci chokes on it with an internal error. So my question is if I can expect this to work at least this much in the long run, or is it a hopelessly fragile hack? Gergely -- http://www.fastmail.fm - Same, same, but different...