#include <stdio.h>#include <stdarg.h> int compile_errors(void){#if TEST == 1  {    /* Not constant */    static int i = (&"Foobar"[1] - &"Foobar"[0]);  }#endif#if TEST == 2  {    /* Not constant */    struct{int c;}v;    static long i=((char*)&(v.c)-(char*)&v);  }#endif#if TEST == 3  {    /* Not constant */    static const short ar[] = { &&l1 - &&l1, &&l2 - &&l1 };    void *p = &&l1 + ar[0];    goto *p;   l1: return 1;   l2: return 2;  }#endif#if TEST == 4  {    /* Only integer allowed */     __builtin_return_address(0 + 1) != NULL;  }#endif  return 0;} intmain(void){}