+// test: hexdump.exe -i hexdump.c -v 3 -e " /\'/" -e ' /\"/' -e ' /\\/' -e ' /\x2a/' -e ' s/\x3A/' | grep l: | wc -l | xargs test 5 =
+// test: hexdump.exe -i hexdump.c -e ' /\n\/* vim:/ p -' | grep -q ': 74 3a 20 2a 2f 0a *t: \*\/\.'
+// test: hexdump.exe -i hexdump.c -e 'p go_to_end' 2>&1 | grep -q 'unknown print length'
+// test: hexdump.exe -i hexdump.c -e '//' 2>&1 | grep -q 'incorrect sequence'
+// test: hexdump.exe -i hexdump.c -e 'foo' 2>&1 | grep -q 'unknown command'