==== tests/cases/compiler/functionOverloads41.ts (1 errors) ====
    function foo(bar:{a:number;}[]):string;
    function foo(bar:{a:boolean;}[]):number;
    function foo(bar:{a:any;}[]):any{ return bar }
    var x = foo([{}]);
                ~~~~
!!! Argument of type '{}[]' is not assignable to parameter of type '{ a: boolean; }[]'.
!!!   Type '{}' is not assignable to type '{ a: boolean; }':
!!!     Property 'a' is missing in type '{}'.