Ludo', On 18/07/17 20:59, Ludovic Courtès wrote: >> Why not throw SIZE into this mix as well? > > Because it can be the symbol 'guess or a number, so that makes things > needlessly complicated IMO. Of course. Thanks for your patience. I got completely lost in the gexp/ungexps of expression->derivation-in-linux-vm. Stupid. Kind regards, T G-R