Hi! As I reported in #39610 , `flush-output-port`, aka `force-output` is no longer working for R6RS transcoded ports. It was still working in Guile 2.0; the regression was introduced in Guile 2.2, via commit "8399e7af5 ("Generic port facility provides buffering uniformly").
I'd be interested in fixing this, but I'm unclear how to tackle it. From a glance at the current code, it seems to me that there is no mechanism in place that can be used to achieve that, as the `flush` method for port types is no more, and I see no way to pass the `flush` operation on transcoded port to the port it is wrapping. My gut approach would be to re-introduce the `flush` operation, but I'm not sure that would be sensible and/or fit into the re-architected ports. If someone, perhaps @wingo (being the author of the re-factoring), could sketch an implementation strategy (or just affirm that re-introducing `flush` is sensible), I would be grateful, and would be one step further in resurrecting my R6RS Scheme code after almost a decade of abandon.  https://debbugs.gnu.org/cgi/bugreport.cgi?bug=39610 Kind Regards, Rotty