On 20/10/2009 13:01, Aswad, Mustafa wrote: > I am try update GUM But I have problem with Tagging and Untagging > closures any can direct me to a document to understand the tagging > procedure. The details are documented here: http://hackage.haskell.org/trac/ghc/wiki/Commentary/Rts/HaskellExecution/PointerTagging Cheers, Simon