github.com/benhoyt/goawk@v1.8.1/testdata/t.do (about)

     1  NF > 0 {
     2  	t = $0
     3  	gsub(/[ \t]+/, "", t)
     4  	n = split($0, y)
     5  	if (n > 0) {
     6  		i = 1
     7  		s = ""
     8  		do {
     9  			s = s $i
    10  		} while (i++ < NF)
    11  	}
    12  	if (s != t)
    13  		print "bad at", NR
    14  }