tests/cases/conformance/parser/ecmascript3/Accessors/parserES3Accessors4.ts(1,15): error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.
==== tests/cases/conformance/parser/ecmascript3/Accessors/parserES3Accessors4.ts (1 errors) ====
var v = { set Foo(a) { } };
~~~
!!! error TS1056: Accessors are only available when targeting ECMAScript 5 and higher.