Deduct and return class type

[Виталий Фадеев]

On Saturday, 23 January 2021 at 05:39:18 UTC, Виталий Фадеев 
wrote:
> Context:
>     data + GUI List
>
> Goal:
>     auto list = new List( data );

Of course, we can use 'factory':

     import std.stdio;


     template List( alias T )
     {
         class List
         {
             T data;

             this( T data )
             {
                 this.data = data;
             }


             // data usage...
         }
     }


     auto  listFactory( T )( T data )
     {
         return new List!( T )( data );
     }

     void main()
     {
         string[] extensions = [ ".d", ".di" ];

         auto list = listFactory( extensions );

         //auto list = new List( extensions );
     }

     source: https://run.dlang.io/is/y167tu


But, how to create class instance with type deduction in usual 
way ?

     auto list = new List( extensions );