modernc.org/ccgo/v3@v3.16.14/lib/testdata/gcc-9.1.0/gcc/testsuite/gcc.c-torture/compile/991026-1.c (about)

     1  void something_f(float);
     2  
     3  int foo(void)
     4  {
     5    union
     6    {
     7      float f;
     8      double d;
     9    } u, *pu = &u;
    10  
    11    u.f = 1.0;
    12    something_f(u.f);
    13  }