Andre W B Furtado wrote:

[...] Isn't updateIORef already defined in module IOExts?

The module Misc is a remnant of ancient library times and could easily be nuked nowadays. Two remarks: * The "official" place to get IORef-related stuff is module IORef. (surprise! ;-) * After some discussions on the GHC/libraries mailing lists we settled for some naming schemes, which led to the renaming of updateIORef to modifyIORef, see: http://haskell.org/ghc/docs/latest/set/hslibs-intro.html#SEC-LIBRARY-MODIFIC... Cheers, S.