tests/cases/compiler/optionalSetterParam.ts(3,16): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.


==== tests/cases/compiler/optionalSetterParam.ts (1 errors) ====
    class foo {
    
        public set bar(param?:any) { }
                   ~~~
!!! error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.
    }