[parser] report error for shorthand property "await" in async arrow formals

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 7698 matching lines @@
     "var f = async(...[await]) => 1;",
     NULL
   };
   // clang-format on
 
   static const ParserFlag always_flags[] = {kAllowHarmonyAsyncAwait};
   RunParserSyncTest(context_data, error_data, kError, NULL, 0, always_flags,
                     arraysize(always_flags));
   RunParserSyncTest(strict_context_data, strict_error_data, kError, NULL, 0,
                     always_flags, arraysize(always_flags));
-  {
-    // TODO(caitp): support these early errors in preparser
-    USE(formal_parameters_data);
-    // const bool kIsModule = false;
-    // const bool kTestPreparser = false;
-    // TODO(caitp): These tests seem to fail test-parsing.cc, even with
-    // test_preparser disabled.
-    // RunParserSyncTest(context_data, formal_parameters_data, kError, NULL, 0,
-    //                 always_flags, arraysize(always_flags), NULL, 0,
-    //                 kIsModule, kTestPreparser);
-  }
+
+  RunParserSyncTest(context_data, formal_parameters_data, kError, NULL, 0,
+                    always_flags, arraysize(always_flags));
 }
 
 TEST(AsyncAwaitModule) {
   // clang-format off
   const char* context_data[][2] = {
     { "", "" },
     { NULL, NULL }
   };
 
   const char* data[] = {
@@ skipping 101 matching lines @@
                               NULL};
   static const ParserFlag always_flags[] = {kAllowHarmonyAsyncAwait};
   // The preparser doesn't enforce the restriction, so turn it off.
   bool test_preparser = false;
   RunParserSyncTest(block_context_data, error_data, kError, NULL, 0,
                     always_flags, arraysize(always_flags), NULL, 0, false,
                     test_preparser);
   RunParserSyncTest(top_level_context_data, error_data, kSuccess, NULL, 0,
                     always_flags, arraysize(always_flags));
 }