class IDL::AST::Union

def instantiate(instantiation_context, _enclosure)
  _params = {
    forward: @forward
  }
  _u = super(instantiation_context, _enclosure, _params)
  _u.set_switchtype(@switchtype.instantiate(instantiation_context))
  _u.validate_labels
  _u.defined = self.is_defined?
  _u
end