EOFBACK CONS and now EOFBACK WARP is convenient for tracking records through a pipeline without reading extra input records, but it creates a weird timing problem: Since the record isn't written to the driver until after it's released, you wind up following the record upstream rather than downstream.
PIPE literal x|eofback cons|pad 2 x|eofback cons|pad 3 x|cons xxx xx x I wrote myself a little COLLECT REXX to do it the old-fashioned way using FANOUT|COPY|SYNCH|FANINANY, but of course SYNCH doesn't terminate until it actually fails to write a record, so it still reads one extra record (and each SYNCH further upstream reads one more). pipe literal 1 2 3|split|a:collect|pad 2 x|a:|pad 3 y|take 1|a:|cons 1 1x 1xy 2 2x 3 Am I overlooking a way to get the records in the right order without any extra? ¬R http://users.bestweb.net/~notr/xmas2008
