50 -c: zero lines
51 -c: one line
52 -c: one line and comment
53 -c: comment first
54 -c: newline
55 -c: newline2
60 file: zero lines
61 file: one line
62 file: one line and comment
63 file: comment first
64 file: newline
65 file: newline2
70 stdin: zero lines
71 stdin: one line
72 stdin: one line and comment
73 stdin: comment first
74 stdin: newline
75 stdin: newline2