interfaceInheritance2.ts(8,1): error TS2454: Variable 'v1' is used before being assigned.


==== interfaceInheritance2.ts (1 errors) ====
    interface I6 {
     ():void;
    }
    
    interface I7 extends I6 { }
    
    var v1:I7;
    v1();
    ~~
!!! error TS2454: Variable 'v1' is used before being assigned.
    