In generators, "yield" cannot be an arrow formal parameter name

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 3804 matching lines @@
                                              kAllowStrongMode};
   RunParserSyncTest(strong_context_data, statement_data, kError, NULL, 0,
                     always_flags, arraysize(always_flags));
   RunParserSyncTest(strict_context_data, statement_data, kError, NULL, 0,
                     always_flags, arraysize(always_flags));
   RunParserSyncTest(sloppy_context_data, statement_data, kSuccess, NULL, 0,
                     always_flags, arraysize(always_flags));
 }
 
 
+TEST(ArrowFunctionsYieldParameterNameInGenerator) {
+  const char* sloppy_function_context_data[][2] = {
+    {"(function f() { (", "); });"},
+    {NULL, NULL}
+  };
+
+  const char* strict_function_context_data[][2] = {
+    {"(function f() {'use strong'; (", "); });"},
+    {"(function f() {'use strict'; (", "); });"},
+    {NULL, NULL}
+  };
+
+  const char* generator_context_data[][2] = {
+    {"(function *g() {'use strong'; (", "); });"},
+    {"(function *g() {'use strict'; (", "); });"},
+    {"(function *g() { (", "); });"},
+    {NULL, NULL}
+  };
+
+  const char* arrow_data[] = {
+    "yield => {}",
+    "(yield) => {}",
+    "(a, yield) => {}",
+    "(yield, a) => {}",
+    "(yield, ...a) => {}",
+    "(a, ...yield) => {}",
+    "({yield}) => {}",
+    "([yield]) => {}",
+    NULL
+  };
+
+  static const ParserFlag always_flags[] = { kAllowHarmonyDestructuring,
+                                             kAllowHarmonyRestParameters,
+                                             kAllowHarmonyArrowFunctions,
+                                             kAllowStrongMode};
+  RunParserSyncTest(sloppy_function_context_data, arrow_data, kSuccess, NULL, 0,
+                    always_flags, arraysize(always_flags));
+  RunParserSyncTest(strict_function_context_data, arrow_data, kError, NULL, 0,
+                    always_flags, arraysize(always_flags));
+  RunParserSyncTest(generator_context_data, arrow_data, kError, NULL, 0,
+                    always_flags, arraysize(always_flags));
+}
+
+
 TEST(SuperNoErrors) {
   // Tests that parser and preparser accept 'super' keyword in right places.
   const char* context_data[][2] = {
     {"class C { m() { ", "; } }"},
     {"class C { m() { k = ", "; } }"},
     {"class C { m() { foo(", "); } }"},
     {"class C { m() { () => ", "; } }"},
     {NULL, NULL}
   };
 
@@ skipping 3060 matching lines @@
     "for (let x of []) {}",
     NULL
   };
   // clang-format on
 
   static const ParserFlag always_flags[] = {kAllowHarmonySloppy,
                                             kAllowHarmonySloppyLet};
   RunParserSyncTest(context_data, data, kSuccess, NULL, 0, always_flags,
                     arraysize(always_flags));
 }