Ah, you mean programs compiled by ghc, not ghc itself. It shouldn't be too difficult to write a `memo` function that memoises its argument using `unsafePerform

Ah, you mean programs compiled by ghc, not ghc itself. It shouldn't be too difficult to write a `memo` function that memoises its argument using `unsafePerformIO` and memcached. There's no need to modify ghc.