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/* { dg-do run } */
/* { dg-options "-Os" } */
 
extern void abort (void);
 
unsigned int a;
int b, c;
 
void
foo (void)
{
  b = 0;
  do {
    for (a = -13; a == 0; a = (unsigned short)a)
      c = 1;
    b++;
  } while (b == 0);
}
 
int
main ()
{
  foo ();
  if (a != -13)
    abort ();
  return 0;
}