==== tests/cases/conformance/functions/functionOverloadErrorsSyntax.ts (3 errors) ====
    //Function overload signature with optional parameter followed by non-optional parameter
    function fn4a(x?: number, y: string);
                              ~
!!! A required parameter cannot follow an optional parameter.
    function fn4a() { }
    
    function fn4b(n: string, x?: number, y: string);
                                         ~
!!! A required parameter cannot follow an optional parameter.
    function fn4b() { }
    
    //Function overload signature with rest param followed by non-optional parameter
    function fn5(x: string, ...y: any[], z: string);
                               ~
!!! A rest parameter must be last in a parameter list.
    function fn5() { }