[parser] report illegal token error in ParseMemberExpressionContinuation()

test/cctest/test-parsing.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 7171 matching lines @@
 
     // crbug.com/582626
     "{ NaN ,chA((evarA=new t ( l = !.0[((... co -a0([1]))=> greturnkf",
     NULL
   };
   // clang-format on
 
   RunParserSyncTest(context_data, error_data, kError, NULL, 0, NULL, 0);
 }
 
+
+TEST(EscapeSequenceErrors) {
+  // clang-format off
+  const char* context_data[][2] = {
+    { "'", "'" },
+    { "\"", "\"" },
+    { "`", "`" },
+    { "`${'", "'}`" },
+    { "`${\"", "\"}`" },
+    { "`${`", "`}`" },
+    { "f(tag`", "`);" },
+    { NULL, NULL }
+  };
+  const char* error_data[] = {
+    "\\uABCG",
+    "\\u{ZZ}",
+    "\\u{FFZ}",
+    "\\u{FFFFFFFFFF }",
+    "\\u{110000}",
+    "\\u{110000",
+    "\\u{FFFD }",
+    "\\xZF",
+    NULL
+  };
+  // clang-format on
+
+  RunParserSyncTest(context_data, error_data, kError, NULL, 0, NULL, 0);
+}
+
+
 TEST(FunctionSentErrors) {
   // clang-format off
   const char* context_data[][2] = {
     { "'use strict'", "" },
     { "", "" },
     { NULL, NULL }
   };
   const char* error_data[] = {
     "var x = function.sent",
     "function* g() { yield function.s\\u0065nt; }",
@@ skipping 83 matching lines @@
   RunParserSyncTest(sloppy_context, error_data, kError);
   RunParserSyncTest(sloppy_context, error_data, kError, NULL, 0,
                     restrictive_flags, arraysize(restrictive_flags));
   RunParserSyncTest(sloppy_context, unrestricted_data, kSuccess);
   RunParserSyncTest(sloppy_context, unrestricted_data, kError, NULL, 0,
                     restrictive_flags, arraysize(restrictive_flags));
   RunParserSyncTest(sloppy_context, sloppy_data, kSuccess);
   RunParserSyncTest(sloppy_context, sloppy_data, kSuccess, restrictive_flags,
                     arraysize(restrictive_flags));
 }