| // Example from C99 6.10.3.4p6 | 
 |  | 
 | // RUN: %clang_cc1 -E %s | FileCheck -strict-whitespace %s | 
 |  | 
 | #define str(s) # s  | 
 | #define xstr(s) str(s)  | 
 | #define debug(s, t) printf("x" # s "= %d, x" # t "= s" \  | 
 |                            x ## s, x ## t)  | 
 | #define INCFILE(n) vers ## n  | 
 | #define glue(a, b) a ## b  | 
 | #define xglue(a, b) glue(a, b)  | 
 | #define HIGHLOW "hello"  | 
 | #define LOW LOW ", world"  | 
 | debug(1, 2);  | 
 | fputs(str(strncmp("abc\0d" "abc", '\4') // this goes away  | 
 |           == 0) str(: @\n), s);  | 
 | include xstr(INCFILE(2).h)  | 
 | glue(HIGH, LOW);  | 
 | xglue(HIGH, LOW)  | 
 |  | 
 |  | 
 | // CHECK: printf("x" "1" "= %d, x" "2" "= s" x1, x2); | 
 | // CHECK: fputs("strncmp(\"abc\\0d\" \"abc\", '\\4') == 0" ": @\n", s); | 
 | // CHECK: include "vers2.h" | 
 | // CHECK: "hello"; | 
 | // CHECK: "hello" ", world" | 
 |  |