gcc/testsuite/gdc.test/fail_compilation/fail11151.d

   1 /*
   2 TEST_OUTPUT:
   3 ---
   4 fail_compilation/fail11151.d(30): Error: overlapping initialization for field `a` and `y`
   5 ---
   6 */
   7
   8 //extern(C) int printf(const char*, ...);
   9
  10 union U
  11 {
  12     struct
  13     {
  14         align(1) long a;
  15         align(1) int b;
  16     }
  17     struct
  18     {
  19         align(1) int x;
  20         align(1) long y;
  21     }
  22 }
  23 void main()
  24 {
  25     static assert(U.a.offsetof == 0);
  26     static assert(U.b.offsetof == 8);
  27     static assert(U.x.offsetof == 0);
  28     static assert(U.y.offsetof == 4);
  29
  30     U u = {a:1, y:2};   // overlapped initializing U.a and U.y
  31
  32     //printf("u.a = %lld\n", u.a);    // 8589934593 , Wrong!
  33     //printf("u.b = %d\n",   u.b);    // 0
  34     //printf("u.x = %d\n",   u.x);    // 1
  35     //printf("u.y = %lld\n", u.y);    // 2
  36 }