Hello, From OCaml's manual, exception marshelling does not fully work. Would it be possible to have it works at least with the same restriction as closure marshalling (i.e. same binary) ? This would be useful when using software like parmap, which at the moment does not support exception, probably for this reason. I did the extension of parmap with exception and felt on the abbve mentioned problem. With parmap, the same binary restriction is fulfilled. Cheers, Christophe