[strong] deprecate empty sub-statements

test/mjsunit/strong/empty-statement.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: --strong-mode
+
+(function NoEmptySubStatement() {
+  assertThrows("'use strong'; if (1);", SyntaxError);
+  assertThrows("'use strong'; if (1) {} else;", SyntaxError);
+  assertThrows("'use strong'; while (1);", SyntaxError);
+  assertThrows("'use strong'; do; while (1);", SyntaxError);
+  assertThrows("'use strong'; for (;;);", SyntaxError);
+  assertThrows("'use strong'; for (x in []);", SyntaxError);
+  assertThrows("'use strong'; for (x of []);", SyntaxError);
+  assertThrows("'use strong'; for (let x;;);", SyntaxError);
+  assertThrows("'use strong'; for (let x in []);", SyntaxError);
+  assertThrows("'use strong'; for (let x of []);", SyntaxError);
+  assertThrows("'use strong'; with ({});", SyntaxError);

[arv (Not doing code reviews), 2015/02/18 19:21:33]

This error is not the error you expect it to be.

+})();