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#include <stdio.h>
#include <wchar.h>
 
int main(void) {
#define STRING(x) x"string"
 
char * l_pString = STRING();
wchar_t * l_pWideString = STRING(L);
	return 0;
}
 

prog.c: In function 'main':
prog.c:8:34: error: 'L' undeclared (first use in this function)
 wchar_t * l_pWideString = STRING(L);
                                  ^
prog.c:5:19: note: in definition of macro 'STRING'
 #define STRING(x) x"string"
                   ^
prog.c:8:34: note: each undeclared identifier is reported only once for each function it appears in
 wchar_t * l_pWideString = STRING(L);
                                  ^
prog.c:5:19: note: in definition of macro 'STRING'
 #define STRING(x) x"string"
                   ^
prog.c:5:20: error: expected ',' or ';' before string constant
 #define STRING(x) x"string"
                    ^
prog.c:8:27: note: in expansion of macro 'STRING'
 wchar_t * l_pWideString = STRING(L);
                           ^
prog.c:8:11: warning: unused variable 'l_pWideString' [-Wunused-variable]
 wchar_t * l_pWideString = STRING(L);
           ^
prog.c:7:8: warning: unused variable 'l_pString' [-Wunused-variable]
 char * l_pString = STRING();
        ^

Standard output is empty