[Haskell-cafe] IORefs and weak pointers

[Patai Gergely]

> Is the IORef or the value in the IORef your key?
I want the IORef itself to be the key. However, that doesn't work with
optimisations turned on (the pointers get wiped out at the first gc), I
guess because they remove the box around the MutVar#. Extracting that
MutVar# seems to solve the problem.

Gergely

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