+// test: grep -q '[c]fla Ags:' test.c; x=$?; rm test.c; test x$x = x0
+// test: hexdump.exe -i hexdump.c -o test.c -e ' s/lags/2041/'
+// test: grep -q '[c]f A:' test.c; x=$?; rm test.c; test x$x = x0
+// test: hexdump.exe -i hexdump.c -e ' s' 2>&1 | grep -q 'erroneous sequence'
+// test: hexdump.exe -i hexdump.c -e ' s//' 2>&1 | grep -q 'erroneous pattern'
+// test: hexdump.exe -i hexdump.c -e ' s/\x41BCD/2041/' 2>&1 | grep -q "can't find pattern"
+// test: hexdump.exe -i hexdump.c -e ' s/cflags/414e5/' 2>&1 | grep -q 'erroneous sequence'