[strong] deprecate empty sub-statements

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 5499 matching lines @@
                     always_flags, arraysize(always_flags));
   RunParserSyncTest(strict_context_data, let_declarations, kSuccess, NULL, 0,
                     always_flags, arraysize(always_flags));
 
   RunParserSyncTest(sloppy_context_data, var_declarations, kSuccess, NULL, 0,
                     always_flags, arraysize(always_flags));
   // At the moment, let declarations are only available in strict mode.
   RunParserSyncTest(sloppy_context_data, let_declarations, kError, NULL, 0,
                     always_flags, arraysize(always_flags));
 }
+
+
+TEST(StrongEmptySubStatements) {
+  const char* sloppy_context_data[][2] = {{"", ""}, {NULL}};
+  const char* strict_context_data[][2] = {{"'use strict';", ""}, {NULL}};
+  const char* strong_context_data[][2] = {{"'use strong';", ""}, {NULL}};
+
+  const char* data[] = {
+      "if (1);",
+      "if (1) {} else;",
+      "while (1);",
+      "do; while (1);",
+      "for (;;);",
+      "for (x in []);",
+      "for (x of []);",
+      "for (const x = 0;;);",
+      "for (const x in []);",
+      "for (const x of []);",
+      NULL};
+
+  static const ParserFlag always_flags[] = {
+      kAllowStrongMode, kAllowHarmonyScoping
+  };
+  RunParserSyncTest(sloppy_context_data, data, kSuccess, NULL, 0, always_flags,
+                    arraysize(always_flags));
+  RunParserSyncTest(strict_context_data, data, kSuccess, NULL, 0, always_flags,
+                    arraysize(always_flags));
+  RunParserSyncTest(strong_context_data, data, kError, NULL, 0, always_flags,
+                    arraysize(always_flags));
+}