Hi Clement. It does not support it. I checked with latest:
CoInterpreter VMMaker.oscog-eem.2347 uuid: 062614a7-e3da-4b30-997a-9568911b9ff5 Mar 16 2018 StackToRegisterMappingCogit VMMaker.oscog-eem.2347 uuid: 062614a7-e3da-4b30-997a-9568911b9ff5 Mar 16 2018 VM: 201803151936 https://github.com/OpenSmalltalk/opensmalltalk-vm.git $ Date: Thu Mar 15 20:36:43 2018 +0100 $ Plugins: 201803151936 https://github.com/OpenSmalltalk/opensmalltalk-vm.git $
Looks like it was build with version from 15 March.