8156619: Unimplemented ES6 features should result in clear Error being thrown
Reviewed-by: sundar, attila
java.lang.RuntimeException: test/script/basic/es6/generator.js#34:6<eval>:1:17 ES6 generator is not yet implemented
function* func() { yield 1; }
^
java.lang.RuntimeException: test/script/basic/es6/generator.js#34:6<eval>:1:23 ES6 generator is not yet implemented
({ * generatorMethod() { yield 1; } })
^
java.lang.RuntimeException: test/script/basic/es6/generator.js#34:6<eval>:1:23 ES6 generator is not yet implemented
var func = function*() { yield 1; }
^