the derived variables (fields & NF) under the END pattern. This
implicitly complies with the SUSv2 specification at
http://www.opengroup.org/onlinepubs/007908799/xcu/awk.html
which explicitly says that NF and NR must retain their values from
the last record seen. Fixes PR#29659.
This is the original New AWK from AT&T Labs as described in "The
AWK Programming Language", by Al Aho, Brian Kernighan, and Peter
Weinberger.
This would eventually replace gawk in our tree in future.