==== tests/cases/conformance/interfaces/interfacesExtendingClasses/interfaceExtendingClassWithPrivates.ts (2 errors) ====
    class Foo {
        private x: string;
    }
    
    interface I extends Foo { // error
              ~
!!! Interface 'I' incorrectly extends interface 'Foo':
!!!   Private property 'x' cannot be reimplemented.
        x: string;
    }
    
    interface I2 extends Foo {
        y: string;
    }
    
    var i: I2;
    var r = i.y;
    var r2 = i.x; // error
             ~~~
!!! Property 'Foo.x' is inaccessible.