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#include <stdlib.h>

union tree_node;

struct tree_common

{

  int a;

  long b;

  long c;

  void *p;

  int d;

};

struct other_tree

{

  struct tree_common common;

  int arr[14];

};

struct tree_vec

{

  struct tree_common common;

  int length;

  union tree_node *a[1];

};

union tree_node

{

  struct other_tree othr;

  struct tree_vec vec;

};

union tree_node global;

union tree_node * __attribute__((noinline))

foo (union tree_node *p, int i)

{

  union tree_node **q;

  p->vec.a[i] = (union tree_node *) 0;

  q = &p->vec.a[1];

  *q = &global;

  return p->vec.a[i];

}

extern void abort (void);

extern void *malloc (__SIZE_TYPE__);

int

main()

{

  union tree_node *p = malloc (sizeof (union tree_node));

  if (foo (p, 1) != &global)

    abort ();

  return 0;

}