ref: 12ad6dffeb56a2ac3b63c13528534767d57d03e7
dir: /sys/src/cmd/diff/test/merge5.expected/
lc: (2,1)::(2,4) rc: (4,7)::(4,7) 1 a b c lc: (5,5)::(8,8) rc: (4,7)::(4,7) 2 3 <<<<<<<<<< test/merge-t5.l 4 x 6 7 ========== original 4 5 6 7 ========== test/merge-t5.r w x y z >>>>>>>>>> 8 9 10