1  /* PR 65048 */
       2  /* { dg-do compile } */
       3  /* { dg-options "-O3 -std=gnu89" } */
       4  
       5  int a, b, c, d;
       6  void fn (void);
       7  
       8  int
       9  foo (x)
      10       int x;
      11  {
      12    switch (x)
      13      {
      14      case 'A':
      15        return 'T';
      16      case 'U':
      17        return 'A';
      18      }
      19  }
      20  
      21  void
      22  bar (int x, int y)
      23  {
      24    switch (c)
      25      {
      26      case 'U':
      27        switch (x)
      28  	{
      29  	default:
      30  	  fn ();
      31  	case 'G':
      32  	  switch (y)
      33  	    {
      34  	    case 'A':
      35  	      d = 7;
      36  	    }
      37  	}
      38      }
      39  }
      40  
      41  void
      42  baz (void)
      43  {
      44    while (1)
      45      {
      46        a = foo ();
      47        b = foo ();
      48        bar (a, b);
      49      }
      50  }
      51