问在switch语句中定义块会导致编译器错误

EN

switch (buttonIndex) {
    case 0:
        [self fooWithCompletion:^{
            [weakSelf finishEditing];
        }];
        break;
    case 1: // Error here
        [self barWithCompletion:^{
            [weakSelf finishEditing];
        }];
        break;    
    default:
        break;
}