typedef octet Bytes[64];

struct S { long len; };

interface foo;

// Union with explicit default label
union U switch (long) {
  case 1: long x;
  case 2: Bytes y;
  case 3: string z;
  case 4:
  case 5: S w;
  case 6: long array[ 10 ][ 20 ];
  case 7: sequence<long> seq;
 default: foo obj;
};

typedef enum E {
  A,
  B
} E_Alias;


// Union with no default label
union U2 switch(E_Alias) {
  case A: long x;
  case B: short y;
};


// Union with implicit default label
union U3 switch(E_Alias) {
  case B: long x;
};

interface foo {
  void bar( in U x, out U y, out U2 z );
};