if (!typeClass.isInterface() && !Modifier.isAbstract(typeClass.getModifiers())) {
            problems.add("Must be defined as an interface or an abstract class.");
        }

        if (typeClass.getTypeParameters().length > 0) {
            problems.add("Cannot be a parameterized type.");
        }
    }

    private static void validateType(StructBindingValidationProblemCollector problems, Class<?> typeClass) {

    if (generate != null) {
      ImmutableList<Parameter> params = Invokable.from(generate).getParameters();
      List<Object> args = Lists.newArrayListWithCapacity(params.size());
      TypeVariable<?>[] typeVars = rawType.getTypeParameters();
      for (int i = 0; i < params.size(); i++) {
        TypeToken<?> paramType = type.resolveType(typeVars[i]);
        // We require all @Generates methods to either be parameter-less or accept non-null

    if (generate != null) {
      ImmutableList<Parameter> params = Invokable.from(generate).getParameters();
      List<Object> args = Lists.newArrayListWithCapacity(params.size());
      TypeVariable<?>[] typeVars = rawType.getTypeParameters();
      for (int i = 0; i < params.size(); i++) {
        TypeToken<?> paramType = type.resolveType(typeVars[i]);
        // We require all @Generates methods to either be parameter-less or accept non-null