tests/cases/compiler/extendGenericArray.ts(6,5): error TS2322: Type 'string' is not assignable to type 'number'.


==== tests/cases/compiler/extendGenericArray.ts (1 errors) ====
    interface Array<T> {
        foo(): T;
    }
    
    var arr: string[] = [];
    var x: number = arr.foo();
        ~
!!! error TS2322: Type 'string' is not assignable to type 'number'.