github.com/benhoyt/goawk@v1.8.1/testdata/gawk/badbuild.awk (about)

     1  $1 == $2 == $3 {
     2  	print "Gawk was built incorrectly."
     3  	print "Use bison, not byacc or something else!"
     4  	print "(Really, why aren't you using the awkgram.c in the distribution?)"
     5  	exit 42
     6  }