BEGIN {
printf "Initially, PROCINFO[\"FS\"] = %s\n", PROCINFO["FS"]
FIELDWIDTHS = "3 4 5 6"
printf "After assign to FIELDWIDTHS, PROCINFO[\"FS\"] = %s\n", PROCINFO["FS"]
FS = FS
printf "After assign to FS, PROCINFO[\"FS\"] = %s\n", PROCINFO["FS"]
}