modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/execute/930208-1.c (about)

     1  typedef union {
     2    long l;
     3    struct { char b3, b2, b1, b0; } c;
     4  } T;
     5  
     6  f (T u)
     7  {
     8    ++u.c.b0;
     9    ++u.c.b3;
    10    return (u.c.b1 != 2 || u.c.b2 != 2);
    11  }
    12  
    13  main ()
    14  {
    15    T u;
    16    u.c.b1 = 2;
    17    u.c.b2 = 2;
    18    u.c.b0 = ~0;
    19    u.c.b3 = ~0;
    20    if (f (u))
    21      abort();
    22    exit (0);
    23  }