==== tests/cases/compiler/extendGenericArray2.ts (1 errors) ====
    interface IFoo<T> {
        x: T;
    }
    
    interface Array<T> extends IFoo<T> { }
    
    var arr: string[] = [];
    var y: number = arr.x;
        ~
!!! Type 'string' is not assignable to type 'number'.