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diff --git a/js/src/tests/ecma_6/Generators/runtime.js b/js/src/tests/ecma_6/Generators/runtime.js
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+// This file was written by Andy Wingo <wingo@igalia.com> and originally
+// contributed to V8 as generators-runtime.js, available here:
+//
+// http://code.google.com/p/v8/source/browse/branches/bleeding_edge/test/mjsunit/harmony/generators-runtime.js
+
+// Test aspects of the generator runtime.
+
+// See http://people.mozilla.org/~jorendorff/es6-draft.html#sec-15.19.3.
+
+function assertSyntaxError(str) {
+    assertThrowsInstanceOf(Function(str), SyntaxError);
+}
+
+
+function f() { }
+function* g() { yield 1; }
+var GeneratorFunctionPrototype = Object.getPrototypeOf(g);
+var GeneratorFunction = GeneratorFunctionPrototype.constructor;
+var GeneratorObjectPrototype = GeneratorFunctionPrototype.prototype;
+
+
+// A generator function should have the same set of properties as any
+// other function.
+function TestGeneratorFunctionInstance() {
+    var f_own_property_names = Object.getOwnPropertyNames(f);
+    var g_own_property_names = Object.getOwnPropertyNames(g);
+
+    f_own_property_names.sort();
+    g_own_property_names.sort();
+
+    assertDeepEq(f_own_property_names, g_own_property_names);
+    var i;
+    for (i = 0; i < f_own_property_names.length; i++) {
+        var prop = f_own_property_names[i];
+        var f_desc = Object.getOwnPropertyDescriptor(f, prop);
+        var g_desc = Object.getOwnPropertyDescriptor(g, prop);
+        assertEq(f_desc.configurable, g_desc.configurable, prop);
+        assertEq(f_desc.writable, g_desc.writable, prop);
+        assertEq(f_desc.enumerable, g_desc.enumerable, prop);
+    }
+}
+TestGeneratorFunctionInstance();
+
+
+// Generators have an additional object interposed in the chain between
+// themselves and Function.prototype.
+function TestGeneratorFunctionPrototype() {
+    // Sanity check.
+    assertEq(Object.getPrototypeOf(f), Function.prototype);
+    assertNotEq(GeneratorFunctionPrototype, Function.prototype);
+    assertEq(Object.getPrototypeOf(GeneratorFunctionPrototype),
+               Function.prototype);
+    assertEq(Object.getPrototypeOf(function* () {}),
+               GeneratorFunctionPrototype);
+}
+TestGeneratorFunctionPrototype();
+
+
+// Functions that we associate with generator objects are actually defined by
+// a common prototype.
+function TestGeneratorObjectPrototype() {
+    // %GeneratorPrototype% must inherit from %IteratorPrototype%.
+    var iterProto = Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()));
+    assertEq(Object.getPrototypeOf(GeneratorObjectPrototype),
+             iterProto);
+    assertEq(Object.getPrototypeOf((function*(){yield 1}).prototype),
+             GeneratorObjectPrototype);
+
+    var expected_property_names = ["next", "return", "throw", "constructor"];
+    var found_property_names =
+        Object.getOwnPropertyNames(GeneratorObjectPrototype);
+
+    expected_property_names.sort();
+    found_property_names.sort();
+
+    assertDeepEq(found_property_names, expected_property_names);
+    assertDeepEq(Object.getOwnPropertySymbols(GeneratorObjectPrototype), [Symbol.toStringTag]);
+}
+TestGeneratorObjectPrototype();
+
+
+// This tests the object that would be called "GeneratorFunction", if it were
+// like "Function".
+function TestGeneratorFunction() {
+    assertEq(GeneratorFunctionPrototype, GeneratorFunction.prototype);
+    assertTrue(g instanceof GeneratorFunction);
+
+    assertEq(Function, Object.getPrototypeOf(GeneratorFunction));
+    assertTrue(g instanceof Function);
+
+    assertEq("function* g() { yield 1; }", g.toString());
+
+    // Not all functions are generators.
+    assertTrue(f instanceof Function);  // Sanity check.
+    assertFalse(f instanceof GeneratorFunction);
+
+    assertTrue((new GeneratorFunction()) instanceof GeneratorFunction);
+    assertTrue(GeneratorFunction() instanceof GeneratorFunction);
+
+    assertTrue(GeneratorFunction('yield 1') instanceof GeneratorFunction);
+    assertTrue(GeneratorFunction('return 1') instanceof GeneratorFunction);
+    assertTrue(GeneratorFunction('a', 'yield a') instanceof GeneratorFunction);
+    assertTrue(GeneratorFunction('a', 'return a') instanceof GeneratorFunction);
+    assertTrue(GeneratorFunction('a', 'return a') instanceof GeneratorFunction);
+    assertSyntaxError("GeneratorFunction('yield', 'return yield')");
+    assertTrue(GeneratorFunction('with (x) return foo;') instanceof GeneratorFunction);
+    assertSyntaxError("GeneratorFunction('\"use strict\"; with (x) return foo;')");
+
+    // Doesn't matter particularly what string gets serialized, as long
+    // as it contains "function*" and "yield 10".
+    assertEq(GeneratorFunction('yield 10').toString(),
+             "function* anonymous() {\nyield 10\n}");
+}
+TestGeneratorFunction();
+
+
+function TestPerGeneratorPrototype() {
+    assertNotEq((function*(){}).prototype, (function*(){}).prototype);
+    assertNotEq((function*(){}).prototype, g.prototype);
+    assertEq(typeof GeneratorFunctionPrototype, "object");
+    assertEq(g.prototype.__proto__.constructor, GeneratorFunctionPrototype, "object");
+    assertEq(Object.getPrototypeOf(g.prototype), GeneratorObjectPrototype);
+    assertFalse(g.prototype instanceof Function);
+    assertEq(typeof (g.prototype), "object");
+
+    assertDeepEq(Object.getOwnPropertyNames(g.prototype), []);
+}
+TestPerGeneratorPrototype();
+
+
+if (typeof reportCompare == "function")
+    reportCompare(true, true);