It doesn't really replace something like print-line debugging, but the type of system that benefits/can use print-line debugging would see no benefit from a str

It doesn't really replace something like print-line debugging, but the type of system that benefits/can use print-line debugging would see no benefit from a structured logging approach either. The systems I'm targeting are producing logs that get fed into multi-petabyte Elasticsearch clusters. To answer your question: the prototype was never finished, but the concepts were adapted to a production version and is used for structured events in a semi-embedded system at my work.