title: Future<Widget> can't be assigned to the list type 'widget'
body: <p>I'm making a dialog screen which contains a dropbox and list view like below.</p>
  <pre><code>showDialog(
          context: context,
          builder: (BuildContext context) {
            return AlertDialog(
              content: StatefulBuilder(
                builder: (BuildContext DialogContext, StateSetter setState) {
                  return Column(
                    children: [
                      Dropdown(DialogContext, setState, 0, ReceiveArgs, _lListOfDepthList), 
                      Dropdown(DialogContext, setState, 1, ReceiveArgs, _lListOfDepthList),                        
                      FutureListView(ReceiveArgs),                                            
                    ],
                  );
                },
              ),
            );
          });
  </code></pre>
  <p>Since I called <code>SetName</code>, which returns a Future, I needed to change 'FutureListView' to a Future function too.</p>
  <pre><code>  Future&lt;Widget&gt; FutureListView(ArgumentClass ReceiveArgs) async{
      String SelectedFullAddress = GetSelectedAddress(5, &quot;&quot;);
  
      _Name = await SetName(ReceiveArgs.lFullList, SelectedFullAddress);
  
      if (_Name.isNotEmpty) {
        print(&quot;ListView!&quot;);
        return ListView.builder(
          itemCount: _Name.length,
          itemBuilder: (context, index) {
            return CheckboxListTile(
              title: Text(_Name[index]),
              value: null,
              onChanged: null,
            );
          },
        );
      } else {
        print(&quot;List Null&quot;);
        return Text(&quot;&quot;);
      }
    }
  </code></pre>
  <p>However after the change, I get this error at compile time:</p>
  <blockquote>
  <p>error: The element type 'Future' can't be assigned to the list type 'Widget'. (list_element_type_not_assignable at [checker_v2])</p>
  </blockquote>
  <p>How do I provide a Future to the List which expects only Widgets?</p>