diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/arguments/defaults-strict-mode.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/arguments/defaults-strict-mode.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+load(libdir + "asserts.js");
+
+function f1(f=(function () { return typeof this !== "object"; })) { "use strict"; return f; }
+assertEq(f1()(), true);
+function f2(f=(function () { "use strict"; return (function () { return typeof this !== "object"; }) })) { assertEq(typeof this, "object"); return f; }
+assertEq(f2()()(), true);
+function f3(f=(function () { return (function () { return typeof this !== "object"; }) })) { "use strict"; return f; }
+assertEq(f3()()(), true);
+// These should be okay.
+function f4(f=(function () { with (Object) {} }), g=(function () { "use strict"; })) {}
+function f5(g=(function () { "use strict"; }), f=(function () { with (Object) {} })) {}
+function f6(f=(function () { return (x for (y in (function g() {}))); })) {}
+
+assertThrowsInstanceOf(function () {
+    eval("function f(a=delete x) { 'use strict'; }");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    Math.sin(4);
+    eval("function f(a='\\251') { 'use strict'; }");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a='\\251', b=delete x) { 'use strict'; }");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a=delete x, b='\\251') { 'use strict'; }");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a=(function () { '\\251'; })) { 'use strict'; }");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a=(function () { with (Object) {} })) { 'use strict'; }");
+}, SyntaxError);
+assertThrowsInstanceOf(function () {
+    eval("function f(a=(function (b, b) {})) { 'use strict'; }");
+}, SyntaxError);