gcc-4.9/gcc/testsuite/gcc.c-torture/compile/20010605-2.c


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/* Origin: Joseph Myers <jsm28@cam.ac.uk>.  */
/* As an extension, GCC allows a struct or union to be cast to its own
   type, but failed to allow this when a typedef was involved.
   Reported as PR c/2735 by <cowan@ccil.org>.  */
union u { int i; };
typedef union u uu;
union u a;
uu b;

void
foo (void)
{
  a = (union u) b;
  a = (uu) b;
  b = (union u) a;
  b = (uu) a;
}