gcc/testsuite/gcc.dg/pr81564.c

/* PR middle-end/81564 ICE in group_case_labels_stmt().  */
/* { dg-do compile }  */
/* { dg-options "-O2" }  */

struct a {
    int b;
    int c;
};

void
foo (void)
{
  struct a *e;
  switch (e->c)
  {
    case 7:
    case 3:
      if (__builtin_expect(!0, 0))
	__builtin_unreachable();
  }
}