Change syntax error message for illegal token.

test/mjsunit/messages.js

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Flags: --stack-size=100 --harmony --harmony-reflect --harmony-regexps
 // Flags: --harmony-simd
 
 function test(f, expected, type) {
   try {
     f();
@@ skipping 321 matching lines @@
    "and a value or writable attribute, #<Object>", TypeError);
 
 
 // === SyntaxError ===
 
 // kInvalidRegExpFlags
 test(function() {
   eval("/a/x.test(\"a\");");
 }, "Invalid regular expression flags", SyntaxError);
 
+// kInvalidSyntax
+test(function() {
+  eval("'\n'");
+}, "Invalid syntax", SyntaxError);
+
 //kJsonParseUnexpectedEOS
 test(function() {
   JSON.parse("{")
 }, "Unexpected end of JSON input", SyntaxError);
 
 // kJsonParseUnexpectedTokenAt
 test(function() {
   JSON.parse("/")
 }, "Unexpected token / in JSON at position 0", SyntaxError);
 
@@ skipping 88 matching lines @@
   Number(1).toString(100);
 }, "toString() radix argument must be between 2 and 36", RangeError);
 
 
 // === URIError ===
 
 // kURIMalformed
 test(function() {
   decodeURI("%%");
 }, "URI malformed", URIError);