Hi, I finally found out where to get the image level code for the Cog Closure Image. http://www.mirandabanda.org/files/Cog/Closures0811/Bootstrap/ I used the latest Squeak 4.0 VM from John and I tried to load the change-sets into the latest Pharo, as well as into the latest Squeak 3.9.1. In both cases it breaks pretty early on. It is easy to add empty dummy classes that the script tries to patch (e.g. DecompilerTest) but then there are dozens of undeclared variables reported on transcript and the file-in eventually dies. The fact that debugger, compiler, browser and compiled methods are then in a strange state doesn't make it easier ... Has anybody had more success with this? Anybody willing to help making this thing work in Pharo? I desire fast closures so badly ... ;-) Lukas -- Lukas Renggli http://www.lukas-renggli.ch