Fund: ES2015 classes are not supported

[ERROR] com.gargoylesoftware.htmlunit.ScriptException: identifier is a reserved word: class

Tested on 2.36.0, 2.37.0 in maven central. Here's a sample HTML file that demonstrates the issue - works in any modern browser, but does not work in htmlunit:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html>
<head>
	<title>ecmascript 2015 class example</title>
</head>
<body>
	<script>
		class Foo {
			constructor(bar) {
				this.bar = bar;
			}
			baz() {
				return "hello " + this.bar;
			}
		}

		console.log(new Foo("world").baz());
	</script>
</body>
</html>

Output in chrome, ff: hello world.

Is this something that needs to be explicitly done upstream in rhino? I didn't find a bug report or PR on their github repo, but I could well have missed it.

Full stack trace of the failure when it occurred:

net.sourceforge.htmlunit.corejs.javascript.EvaluatorException: identifier is a reserved word: class (script in http://localhost:39421/sample.html from (7, 10) to (18, 11)#8)
	at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory$HtmlUnitErrorReporter.error(HtmlUnitContextFactory.java:438)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.addError(Parser.java:258)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.reportError(Parser.java:326)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.reportError(Parser.java:313)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.primaryExpr(Parser.java:3186)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.memberExpr(Parser.java:2743)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.unaryExpr(Parser.java:2637)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.mulExpr(Parser.java:2558)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.addExpr(Parser.java:2542)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.shiftExpr(Parser.java:2523)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.relExpr(Parser.java:2498)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.eqExpr(Parser.java:2470)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.bitAndExpr(Parser.java:2459)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.bitXorExpr(Parser.java:2448)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.bitOrExpr(Parser.java:2437)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.andExpr(Parser.java:2426)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.orExpr(Parser.java:2415)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.condExpr(Parser.java:2379)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.assignExpr(Parser.java:2335)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.expr(Parser.java:2314)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.statementHelper(Parser.java:1273)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.statement(Parser.java:1127)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.parse(Parser.java:664)
	at net.sourceforge.htmlunit.corejs.javascript.Parser.parse(Parser.java:583)
	at net.sourceforge.htmlunit.corejs.javascript.Context.parse(Context.java:2637)
	at net.sourceforge.htmlunit.corejs.javascript.Context.compileImpl(Context.java:2586)
	at net.sourceforge.htmlunit.corejs.javascript.Context.compileString(Context.java:1590)
	at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory$TimeoutContext.compileString(HtmlUnitContextFactory.java:224)
	at net.sourceforge.htmlunit.corejs.javascript.Context.compileString(Context.java:1579)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$1.doRun(JavaScriptEngine.java:704)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine$HtmlUnitContextAction.run(JavaScriptEngine.java:867)
	at net.sourceforge.htmlunit.corejs.javascript.Context.call(Context.java:624)
	at net.sourceforge.htmlunit.corejs.javascript.ContextFactory.call(ContextFactory.java:537)
	at com.gargoylesoftware.htmlunit.javascript.HtmlUnitContextFactory.callSecured(HtmlUnitContextFactory.java:354)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.compile(JavaScriptEngine.java:713)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.compile(JavaScriptEngine.java:679)
	at com.gargoylesoftware.htmlunit.javascript.JavaScriptEngine.execute(JavaScriptEngine.java:725)
	at com.gargoylesoftware.htmlunit.html.HtmlPage.executeJavaScript(HtmlPage.java:924)
	at com.gargoylesoftware.htmlunit.html.HtmlScript.executeInlineScriptIfNeeded(HtmlScript.java:305)
	at com.gargoylesoftware.htmlunit.html.HtmlScript.executeScriptIfNeeded(HtmlScript.java:395)
	at com.gargoylesoftware.htmlunit.html.HtmlScript$2.execute(HtmlScript.java:234)
	at com.gargoylesoftware.htmlunit.html.HtmlScript.onAllChildrenAddedToPage(HtmlScript.java:256)
	at com.gargoylesoftware.htmlunit.html.parser.neko.HtmlUnitNekoDOMBuilder.endElement(HtmlUnitNekoDOMBuilder.java:559)
	at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
	at com.gargoylesoftware.htmlunit.html.parser.neko.HtmlUnitNekoDOMBuilder.endElement(HtmlUnitNekoDOMBuilder.java:513)
	at net.sourceforge.htmlunit.cyberneko.HTMLTagBalancer.callEndElement(HTMLTagBalancer.java:1192)
	at net.sourceforge.htmlunit.cyberneko.HTMLTagBalancer.endElement(HTMLTagBalancer.java:1132)
	at net.sourceforge.htmlunit.cyberneko.filters.DefaultFilter.endElement(DefaultFilter.java:219)
	at net.sourceforge.htmlunit.cyberneko.filters.NamespaceBinder.endElement(NamespaceBinder.java:312)
	at net.sourceforge.htmlunit.cyberneko.HTMLScanner$ContentScanner.scanEndElement(HTMLScanner.java:3185)
	at net.sourceforge.htmlunit.cyberneko.HTMLScanner$ContentScanner.scan(HTMLScanner.java:2110)
	at net.sourceforge.htmlunit.cyberneko.HTMLScanner.scanDocument(HTMLScanner.java:937)
	at net.sourceforge.htmlunit.cyberneko.HTMLConfiguration.parse(HTMLConfiguration.java:443)
	at net.sourceforge.htmlunit.cyberneko.HTMLConfiguration.parse(HTMLConfiguration.java:394)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at com.gargoylesoftware.htmlunit.html.parser.neko.HtmlUnitNekoDOMBuilder.parse(HtmlUnitNekoDOMBuilder.java:758)
	at com.gargoylesoftware.htmlunit.html.parser.neko.HtmlUnitNekoHtmlParser.parse(HtmlUnitNekoHtmlParser.java:236)
	at com.gargoylesoftware.htmlunit.html.parser.neko.HtmlUnitNekoHtmlParser.parseHtml(HtmlUnitNekoHtmlParser.java:179)
	at com.gargoylesoftware.htmlunit.DefaultPageCreator.createHtmlPage(DefaultPageCreator.java:280)
	at com.gargoylesoftware.htmlunit.DefaultPageCreator.createPage(DefaultPageCreator.java:163)
	at com.gargoylesoftware.htmlunit.WebClient.loadWebResponseInto(WebClient.java:553)
	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:419)
	at com.gargoylesoftware.htmlunit.WebClient.getPage(WebClient.java:336)
	at org.openqa.selenium.htmlunit.HtmlUnitDriver.get(HtmlUnitDriver.java:715)

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ES2015 classes are not supported

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