8156619: Unimplemented ES6 features should result in clear Error being thrown
Reviewed-by: sundar, attila
java.lang.RuntimeException: test/script/basic/es6/super.js#34:8<eval>:1:10 ES6 super keyword is not yet implemented
({ meth() { x = super.x } })
^
java.lang.RuntimeException: test/script/basic/es6/super.js#34:8<eval>:1:10 ES6 super keyword is not yet implemented
({ meth() { x = super.x() } })
^
java.lang.RuntimeException: test/script/basic/es6/super.js#34:8<eval>:1:10 ES6 super keyword is not yet implemented
({ meth() { x = super['x'] } })
^