This file is testing line counting in various scenarios involving
escaped newlines, including using the trigraph escape sequence

--> __LINE__ 4
"multi-\
line ??/
string"
--> __LINE__ 8
'multi-\
line ??/
character constant'
--> __LINE__ 12
multi-\
line 012\
345??/
678 integer constant
--> __LINE__ 17
multi-\
line\
 li??/
st ??/
of \
tokens
--> __LINE__ 24
/* multi-\
line ??/
comment */
--> __LINE__ 28
 /\
??/
*/ comment with escaped newlines /*
         in the markers
??/
*\
/
--> __LINE__ 36
// multi-\
line ??/
C++ comment
--> __LINE__ 40
\
 \
 /\
??/
\
/ ??/
  C++ comment with leading whitespace and escaped newlines
--> __LINE__ 48
#pragma multi-\
line ??/
#pragma directive
--> __LINE__ 52
#define FOO multi-\
line macro /* with\
 a comment *??/
/ embedded
--> __LINE__ 57
FOO
--> __LINE__ 59
/??/
*  comment \
   before ??/
   directive */ #define BAR macro with a leading comment
--> __LINE__ 64
BAR
--> __LINE__ 66
\
 ??/
	#define BAZ macro with leading whitespace and escaped newlines
--> __LINE__ 70
BAZ
--> __LINE__ 72
#define POTATO a token split by escaped newlines
PO\
TA??/
TO
--> __LINE__ 77
#if 0
#pragma multi-??/
line \
#pragma inside if-false block
--> __LINE__ 82
#else
#pragma multi-??/
line \
#pragma inside if-true block
--> __LINE__ 87
#endif
--> __LINE__ 89
/* comment */ # pragma with a preceding comment
--> __LINE__ 91
#if 0
/* multi-\
 * line comment at flslvl=1
 */
#endif
--> __LINE__ 97

.