[strong] make function and class declarations lexical & immutable

test/mjsunit/strong/functions.js

Index: test/mjsunit/strong/functions.js
diff --git a/test/mjsunit/strong/arguments.js b/test/mjsunit/strong/functions.js
similarity index 64%
rename from test/mjsunit/strong/arguments.js
rename to test/mjsunit/strong/functions.js
index b40b661ccf2243d565a42b3aa8567ddab3486536..4869ac6dfaef35befff01bac577b6bb57576936e 100644
--- a/test/mjsunit/strong/arguments.js
+++ b/test/mjsunit/strong/functions.js
@@ -4,6 +4,8 @@
 
 // Flags: --strong-mode
 
+'use strong';
+
 (function NoArguments() {
   assertThrows("'use strong'; arguments", SyntaxError);
   assertThrows("'use strong'; function f() { arguments }", SyntaxError);
@@ -14,3 +16,18 @@
   assertThrows("'use strong'; function f(arguments) {}", SyntaxError);
   assertThrows("'use strong'; let f = (arguments) => {}", SyntaxError);
 })();
+
+function g() {}
+
+(function LexicalFunctionBindings(global) {
+  assertEquals('function', typeof g);
+  assertEquals(undefined, global.g);
+})(this);
+
+(function ImmutableFunctionBindings() {
+  function f() {}
+  assertThrows(function(){ eval("g = 0") }, TypeError);
+  assertThrows(function(){ eval("f = 0") }, TypeError);
+  assertEquals('function', typeof g);
+  assertEquals('function', typeof f);
+})();