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/* { dg-do compile } */
/* { dg-options "-O2 -Wuninitialized" } */
 
typedef union tree_node *tree;
 
struct tree_common
{
  tree chain;
};
 
struct tree_decl
{
  struct tree_common common;
  tree name;
};
 
 
union tree_node
{
  struct tree_common common;
  struct tree_decl decl;
};
 
int pedantic;
 
void
finish_struct (tree t, tree fieldlist, tree attributes)
{
  union tree_node * x;
 
  if (pedantic)
    {
      x = fieldlist;
      if (x->decl.name == 0)
	{
	  while (x)
	    x = x->common.chain;
	  foo (fieldlist);
	}
    }
 
  x = fieldlist;
  if (x)
    {
      do
	{
	  x = x->common.chain;
	} while (x != 0);
    }
 
  bar1 (&fieldlist);
}