==== tests/cases/compiler/functionOverloads22.ts (1 errors) ====
    function foo(bar:number):{a:number;}[];
    function foo(bar:string):{a:number; b:string;}[];
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
!!! Overload signature is not compatible with function implementation.
    function foo(bar:any):{a:any;b?:any;}[] { return [{a:""}] }