modernc.org/cc@v1.0.1/testdata/gcc-6.3.0/gcc/testsuite/gcc.c-torture/compile/pr40321.c (about)

     1  struct X { int flag; int pos; };
     2  int foo(struct X *a, struct X *b)
     3  {
     4    while (1)
     5      {
     6        if (a->flag)
     7  	break;
     8        ({ struct X *tmp = a; a = b; b = tmp; });
     9      }
    10  
    11    return a->pos + b->pos;
    12  }