[strong] Deprecate delete

test/mjsunit/strong/use-strong.js

+// Copyright 2014 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 UseStrongScoping() {
+  assertThrows("'use strong'; 0 == 0", SyntaxError);
+  assertThrows("'use strong'; try {} catch(e) { { 0 == 0 } }", SyntaxError);
+  assertThrows("function f() { 'use strong'; 0 == 0 }", SyntaxError);
+  assertThrows("'use strong'; function f() { 0 == 0 }", SyntaxError);
+  assertThrows("'use strong'; function f() { function g() { 0 == 0 } }", SyntaxError);
+  assertThrows("'use strong'; eval('function f() { 0 == 0 }')", SyntaxError);
+  assertTrue(eval("function f() { 'use strong' } 0 == 0"));
+  assertTrue(eval("eval('\\\'use strong\\\''); 0 == 0"));
+})();
+
+(function UseStrongMixed() {
+  assertThrows("'use strict'; 'use strong'; 0 == 0", SyntaxError);
+  assertThrows("'use strong'; 'use strict'; 0 == 0", SyntaxError);
+  assertThrows("'use strong'; 'use strong'; 0 == 0", SyntaxError);
+  assertThrows("'use strict'; function f() { 'use strong'; 0 == 0 }", SyntaxError);
+  assertThrows("'use strong'; function f() { 'use strict'; 0 == 0 }", SyntaxError);
+  assertTrue(eval("'use strict'; function f() { 'use strong' } 0 == 0"));
+  assertTrue(eval("var x; function f() { 'use strong' } delete x"));
+  assertThrows("'use strict'; var x; function f() { 'use strong' } delete x", SyntaxError);
+})();