qemu/tests/qapi-schema/union-base-empty.json

# Union with empty base and therefore without discriminator

{ 'struct': 'Empty', 'data': { } }

{ 'union': 'TestUnion',
  'base': 'Empty',
  'discriminator': 'type',
  'data': { 'value1': 'int',
            'value2': 'str' } }