==== tests/cases/compiler/assignmentCompatability10.ts (1 errors) ====
    module __test1__ {
        export interface interfaceWithPublicAndOptional<T,U> { one: T; two?: U; };  var obj4: interfaceWithPublicAndOptional<number,string> = { one: 1 };;
        export var __val__obj4 = obj4;
    }
    module __test2__ {
        export class classWithPublicAndOptional<T,U> { constructor(public one: T, public two?: U) {} }   var x4 = new classWithPublicAndOptional<number, string>(1);;
        export var __val__x4 = x4;
    }
    __test2__.__val__x4 = __test1__.__val__obj4
    ~~~~~~~~~~~~~~~~~~~
!!! Type 'interfaceWithPublicAndOptional<number, string>' is not assignable to type 'classWithPublicAndOptional<number, string>':
!!!   Required property 'two' cannot be reimplemented with optional property in 'interfaceWithPublicAndOptional<number, string>'.