Add m-esr52 at 52.6.0

20 files changed, 1592 insertions, 0 deletions

diff --git a/js/src/tests/ecma_6/Expressions/ToPropertyKey-symbols.js b/js/src/tests/ecma_6/Expressions/ToPropertyKey-symbols.js
new file mode 100644
index 000000000..32b3994b3
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/ToPropertyKey-symbols.js
@@ -0,0 +1,90 @@
+var symbols = [
+    Symbol(), Symbol("iterator"), Symbol.for("iterator"), Symbol.iterator
+];
+
+for (var sym of symbols) {
+    var key = {
+        toString() { return sym; }
+    };
+
+    // Test that ToPropertyKey can return a symbol in each of the following
+    // contexts.
+
+    // Computed property names.
+    var obj = {[key]: 13};
+    var found = Reflect.ownKeys(obj);
+    assertEq(found.length, 1);
+    assertEq(found[0], sym);
+
+    // Computed accessor property names.
+    var obj2 = {
+        get [key]() { return "got"; },
+        set [key](v) { this.v = v; }
+    };
+    assertEq(obj2[sym], "got");
+    obj2[sym] = 33;
+    assertEq(obj2.v, 33);
+
+    // Getting and setting properties.
+    assertEq(obj[key], 13);
+    obj[key] = 19;
+    assertEq(obj[sym], 19);
+    (function () { "use strict"; obj[key] = 20; })();
+    assertEq(obj[sym], 20);
+    obj[key]++;
+    assertEq(obj[sym], 21);
+
+    // Getting properties of primitive values.
+    Number.prototype[sym] = "success";
+    assertEq(Math.PI[key], "success");
+    delete Number.prototype[sym];
+
+    // Getting a super property.
+    class X {
+        [sym]() { return "X"; }
+    }
+    class Y extends X {
+        [sym]() { return super[key]() + "Y"; }
+    }
+    var y = new Y();
+    assertEq(y[sym](), "XY");
+
+    // Setting a super property.
+    class Z {
+        set [sym](v) {
+            this.self = this;
+            this.value = v;
+        }
+    }
+    class W extends Z {
+        set [sym](v) {
+            this.isW = true;
+            super[key] = v;
+        }
+    }
+    var w = new W();
+    w[key] = "ok";
+    assertEq(w.self, w);
+    assertEq(w.value, "ok");
+    assertEq(w.isW, true);
+
+    // Deleting properties.
+    obj = {[sym]: 1};
+    assertEq(delete obj[key], true);
+    assertEq(sym in obj, false);
+
+    // LHS of `in` expressions.
+    assertEq(key in {iterator: 0}, false);
+    assertEq(key in {[sym]: 0}, true);
+
+    // Methods of Object and Object.prototype
+    obj = {};
+    Object.defineProperty(obj, key, {value: "ok", enumerable: true});
+    assertEq(obj[sym], "ok");
+    assertEq(obj.hasOwnProperty(key), true);
+    assertEq(obj.propertyIsEnumerable(key), true);
+    var desc = Object.getOwnPropertyDescriptor(obj, key);
+    assertEq(desc.value, "ok");
+}
+
+reportCompare(0, 0);
diff --git a/js/src/tests/ecma_6/Expressions/binary-literals.js b/js/src/tests/ecma_6/Expressions/binary-literals.js
new file mode 100644
index 000000000..df1f2ed6f
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/binary-literals.js
@@ -0,0 +1,115 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 894026;
+var summary = "Implement ES6 binary literals";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var chars = ['b', 'B'];
+
+for (var i = 0; i < 2; i++)
+{
+  if (i === 2)
+  {
+    chars.forEach(function(v)
+    {
+      try
+      {
+        eval('0' + v + i);
+        throw "didn't throw";
+      }
+      catch (e)
+      {
+        assertEq(e instanceof SyntaxError, true,
+                 "no syntax error evaluating 0" + v + i + ", " +
+                 "got " + e);
+      }
+    });
+    continue;
+  }
+
+  for (var j = 0; j < 2; j++)
+  {
+    if (j === 2)
+    {
+      chars.forEach(function(v)
+      {
+        try
+        {
+          eval('0' + v + i + j);
+          throw "didn't throw";
+        }
+        catch (e)
+        {
+          assertEq(e instanceof SyntaxError, true,
+                   "no syntax error evaluating 0" + v + i + j + ", " +
+                   "got " + e);
+        }
+      });
+      continue;
+    }
+
+    for (var k = 0; k < 2; k++)
+    {
+      if (k === 2)
+      {
+        chars.forEach(function(v)
+        {
+          try
+          {
+            eval('0' + v + i + j + k);
+            throw "didn't throw";
+          }
+          catch (e)
+          {
+            assertEq(e instanceof SyntaxError, true,
+                     "no syntax error evaluating 0" + v + i + j + k + ", " +
+                     "got " + e);
+          }
+        });
+        continue;
+      }
+
+      chars.forEach(function(v)
+      {
+        assertEq(eval('0' + v + i + j + k), i * 4 + j * 2 + k);
+      });
+    }
+  }
+}
+
+chars.forEach(function(v)
+{
+  try
+  {
+  }
+  catch (e)
+  {
+    assertEq(e instanceof SyntaxError, true,
+             "no syntax error evaluating 0" + v + ", got " + e);
+  }
+});
+
+// Off-by-one check: '/' immediately precedes '0'.
+assertEq(0b110/1, 6);
+assertEq(0B10110/1, 22);
+
+function strict()
+{
+  "use strict";
+  return 0b11010101;
+}
+assertEq(strict(), 128 + 64 + 16 + 4 + 1);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");
diff --git a/js/src/tests/ecma_6/Expressions/browser.js b/js/src/tests/ecma_6/Expressions/browser.js
new file mode 100644
index 000000000..e69de29bb
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/browser.js
diff --git a/js/src/tests/ecma_6/Expressions/computed-property-side-effects.js b/js/src/tests/ecma_6/Expressions/computed-property-side-effects.js
new file mode 100644
index 000000000..54dec7416
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/computed-property-side-effects.js
@@ -0,0 +1,35 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1199695;
+var summary =
+  "Computed property names must be considered as always effectful even when " +
+  "the name expression isn't effectful, because calling ToPropertyKey on " +
+  "some non-effectful expressions has user-modifiable behavior";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+RegExp.prototype.toString = () => { throw 42; };
+assertThrowsValue(function() {
+  ({ [/regex/]: 0 }); // ToPropertyKey(/regex/) throws 42
+}, 42);
+
+function Q() {
+  ({ [new.target]: 0 }); // new.target will be Q, ToPropertyKey(Q) throws 17
+}
+Q.toString = () => { throw 17; };
+assertThrowsValue(function() {
+  new Q;
+}, 17);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");
diff --git a/js/src/tests/ecma_6/Expressions/delete-constant-folded-and-or.js b/js/src/tests/ecma_6/Expressions/delete-constant-folded-and-or.js
new file mode 100644
index 000000000..9576413a6
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/delete-constant-folded-and-or.js
@@ -0,0 +1,41 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1183400;
+var summary =
+  "Deletion of a && or || expression that constant-folds to a name must not " +
+  "attempt to delete the name";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+Object.defineProperty(this, "nonconfigurable", { value: 42 });
+assertEq(nonconfigurable, 42);
+
+assertEq(delete nonconfigurable, false);
+assertEq(delete (true && nonconfigurable), true);
+
+function nested()
+{
+  assertEq(delete nonconfigurable, false);
+  assertEq(delete (true && nonconfigurable), true);
+}
+nested();
+
+function nestedStrict()
+{
+  "use strict";
+  assertEq(delete (true && nonconfigurable), true);
+}
+nestedStrict();
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");
diff --git a/js/src/tests/ecma_6/Expressions/delete-name-parenthesized-early-error-strict-mode.js b/js/src/tests/ecma_6/Expressions/delete-name-parenthesized-early-error-strict-mode.js
new file mode 100644
index 000000000..d28afb665
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/delete-name-parenthesized-early-error-strict-mode.js
@@ -0,0 +1,76 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1111101;
+var summary =
+  "delete (foo), delete ((foo)), and so on are strict mode early errors";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function checkSyntaxError(code)
+{
+  function helper(maker)
+  {
+    var earlyError = false;
+    try
+    {
+      var f = maker(code);
+
+      var error = "no early error, created a function with code <" + code + ">";
+      try
+      {
+        f();
+        error += ", and the function can be called without error";
+      }
+      catch (e)
+      {
+        error +=", and calling the function throws " + e;
+      }
+
+      throw new Error(error);
+    }
+    catch (e)
+    {
+      assertEq(e instanceof SyntaxError, true,
+               "expected syntax error, got " + e);
+    }
+  }
+
+  helper(Function);
+  helper(eval);
+}
+
+checkSyntaxError("function f() { 'use strict'; delete escape; } f();");
+checkSyntaxError("function f() { 'use strict'; delete escape; }");
+checkSyntaxError("function f() { 'use strict'; delete (escape); } f();");
+checkSyntaxError("function f() { 'use strict'; delete (escape); }");
+checkSyntaxError("function f() { 'use strict'; delete ((escape)); } f();");
+checkSyntaxError("function f() { 'use strict'; delete ((escape)); }");
+
+// Meanwhile, non-strict all of these should work
+
+function checkFine(code)
+{
+  Function(code);
+  (1, eval)(code); // indirect, to be consistent w/above
+}
+
+checkFine("function f() { delete escape; } f();");
+checkFine("function f() { delete escape; }");
+checkFine("function f() { delete (escape); } f();");
+checkFine("function f() { delete (escape); }");
+checkFine("function f() { delete ((escape)); } f();");
+checkFine("function f() { delete ((escape)); }");
+
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");
diff --git a/js/src/tests/ecma_6/Expressions/destructuring-array-default-call.js b/js/src/tests/ecma_6/Expressions/destructuring-array-default-call.js
new file mode 100644
index 000000000..a3a362205
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/destructuring-array-default-call.js
@@ -0,0 +1,10 @@
+var BUGNUMBER = 1184922;
+var summary = "Array destructuring with various default values in various context - call/new expression";
+
+print(BUGNUMBER + ": " + summary);
+
+testDestructuringArrayDefault("func()");
+testDestructuringArrayDefault("new func()");
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
diff --git a/js/src/tests/ecma_6/Expressions/destructuring-array-default-class.js b/js/src/tests/ecma_6/Expressions/destructuring-array-default-class.js
new file mode 100644
index 000000000..808308928
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/destructuring-array-default-class.js
@@ -0,0 +1,72 @@
+var BUGNUMBER = 1184922;
+var summary = "Array destructuring with various default values in various context - class expression and super/new.target";
+
+print(BUGNUMBER + ": " + summary);
+
+testDestructuringArrayDefault(`class E {
+  constructor() {}
+  method() {}
+  get v() {}
+  set v(_) {}
+  static method() {}
+  static get v() {}
+  static set v(_) {}
+}`);
+
+testDestructuringArrayDefault(`class E extends C {
+  constructor() {}
+  method() {}
+  get v() {}
+  set v(_) {}
+  static method() {}
+  static get v() {}
+  static set v(_) {}
+}`);
+
+var opt = {
+    no_plain: true,
+    no_func: true,
+    no_func_arg: true,
+    no_gen: true,
+    no_gen_arg: true,
+    no_ctor: true,
+    no_method: true,
+    no_pre_super: true,
+    no_comp: true,
+
+    no_derived_ctor: false,
+};
+testDestructuringArrayDefault("super()", opt);
+
+opt = {
+    no_plain: true,
+    no_func: true,
+    no_func_arg: true,
+    no_gen: true,
+    no_gen_arg: true,
+    no_ctor: true,
+    no_comp: true,
+
+    no_derived_ctor: false,
+    no_method: false,
+    no_pre_super: false,
+};
+testDestructuringArrayDefault("super.foo()", opt);
+
+opt = {
+    no_plain: true,
+
+    no_func: false,
+    no_func_arg: false,
+    no_gen: false,
+    no_gen_arg: false,
+    no_ctor: false,
+    no_derived_ctor: false,
+    no_method: false,
+    no_pre_super: false,
+    no_comp: false,
+};
+testDestructuringArrayDefault("new.target", opt);
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
diff --git a/js/src/tests/ecma_6/Expressions/destructuring-array-default-function-nested.js b/js/src/tests/ecma_6/Expressions/destructuring-array-default-function-nested.js
new file mode 100644
index 000000000..99260b989
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/destructuring-array-default-function-nested.js
@@ -0,0 +1,11 @@
+var BUGNUMBER = 1184922;
+var summary = "Array destructuring with various default values in various context - function expression with nested objects";
+
+print(BUGNUMBER + ": " + summary);
+
+testDestructuringArrayDefault("function f() { return { f() {}, *g() {}, r: /a/ }; }");
+testDestructuringArrayDefault("function* g() { return { f() {}, *g() {}, r: /b/ }; }");
+testDestructuringArrayDefault("() => { return { f() {}, *g() {}, r: /c/ }; }");
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
diff --git a/js/src/tests/ecma_6/Expressions/destructuring-array-default-function.js b/js/src/tests/ecma_6/Expressions/destructuring-array-default-function.js
new file mode 100644
index 000000000..5d2ffef18
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/destructuring-array-default-function.js
@@ -0,0 +1,11 @@
+var BUGNUMBER = 1184922;
+var summary = "Array destructuring with various default values in various context - function expression";
+
+print(BUGNUMBER + ": " + summary);
+
+testDestructuringArrayDefault("function f() {}");
+testDestructuringArrayDefault("function* g() {}");
+testDestructuringArrayDefault("() => {}");
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
diff --git a/js/src/tests/ecma_6/Expressions/destructuring-array-default-simple.js b/js/src/tests/ecma_6/Expressions/destructuring-array-default-simple.js
new file mode 100644
index 000000000..50c6c37f3
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/destructuring-array-default-simple.js
@@ -0,0 +1,16 @@
+var BUGNUMBER = 1184922;
+var summary = "Array destructuring with various default values in various context - simple literal";
+
+print(BUGNUMBER + ": " + summary);
+
+testDestructuringArrayDefault("'foo'");
+testDestructuringArrayDefault("`foo`");
+testDestructuringArrayDefault("func`foo`");
+
+testDestructuringArrayDefault("/foo/");
+
+testDestructuringArrayDefault("{}");
+testDestructuringArrayDefault("[]");
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
diff --git a/js/src/tests/ecma_6/Expressions/destructuring-array-default-yield.js b/js/src/tests/ecma_6/Expressions/destructuring-array-default-yield.js
new file mode 100644
index 000000000..57ff9e947
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/destructuring-array-default-yield.js
@@ -0,0 +1,22 @@
+var BUGNUMBER = 1184922;
+var summary = "Array destructuring with various default values in various context - yield expression";
+
+print(BUGNUMBER + ": " + summary);
+
+var opt = {
+    no_plain: true,
+    no_func: true,
+    no_func_arg: true,
+    no_gen_arg: true,
+    no_ctor: true,
+    no_derived_ctor: true,
+    no_method: true,
+    no_pre_super: true,
+    no_comp: true,
+
+    no_gen: false,
+};
+testDestructuringArrayDefault("yield 1", opt);
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
diff --git a/js/src/tests/ecma_6/Expressions/destructuring-array-done.js b/js/src/tests/ecma_6/Expressions/destructuring-array-done.js
new file mode 100644
index 000000000..f2c7e9410
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/destructuring-array-done.js
@@ -0,0 +1,319 @@
+var BUGNUMBER = 1184922;
+var summary = "iterator.next() should not be called when after iterator completes";
+
+print(BUGNUMBER + ": " + summary);
+
+var log;
+function reset() {
+    log = "";
+}
+var obj = new Proxy({}, {
+    set(that, name, value) {
+        var v;
+        if (value instanceof Function || value instanceof RegExp)
+            v = value.toString();
+        else
+            v = JSON.stringify(value);
+        log += "set:" + name + "=" + v + ",";
+    }
+});
+function createIterable(n) {
+    return {
+        i: 0,
+        [Symbol.iterator]() {
+            return this;
+        },
+        next() {
+            log += "next,";
+            this.i++;
+            if (this.i <= n)
+                return {value: this.i, done: false};
+            return {value: 0, done: true};
+        }
+    };
+}
+
+// Simple pattern.
+
+reset();
+[obj.a, obj.b, obj.c] = createIterable(0);
+assertEq(log,
+         "next," +
+         "set:a=undefined," +
+         "set:b=undefined," +
+         "set:c=undefined,");
+
+reset();
+[obj.a, obj.b, obj.c] = createIterable(1);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=undefined," +
+         "set:c=undefined,");
+
+reset();
+[obj.a, obj.b, obj.c] = createIterable(2);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=2," +
+         "next," +
+         "set:c=undefined,");
+
+reset();
+[obj.a, obj.b, obj.c] = createIterable(3);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=2," +
+         "next," +
+         "set:c=3,");
+
+// Elision.
+
+reset();
+[obj.a, , obj.b, , , obj.c, ,] = createIterable(0);
+assertEq(log,
+         "next," +
+         "set:a=undefined," +
+         "set:b=undefined," +
+         "set:c=undefined,");
+
+reset();
+[obj.a, , obj.b, , , obj.c, ,] = createIterable(1);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=undefined," +
+         "set:c=undefined,");
+
+reset();
+[obj.a, , obj.b, , , obj.c, ,] = createIterable(2);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "next," +
+         "set:b=undefined," +
+         "set:c=undefined,");
+
+reset();
+[obj.a, , obj.b, , , obj.c, ,] = createIterable(3);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "next," +
+         "set:b=3," +
+         "next," +
+         "set:c=undefined,");
+
+reset();
+[obj.a, , obj.b, , , obj.c, ,] = createIterable(4);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "next," +
+         "set:b=3," +
+         "next," +
+         "next," +
+         "set:c=undefined,");
+
+reset();
+[obj.a, , obj.b, , , obj.c, ,] = createIterable(5);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "next," +
+         "set:b=3," +
+         "next," +
+         "next," +
+         "next," +
+         "set:c=undefined,");
+
+reset();
+[obj.a, , obj.b, , , obj.c, ,] = createIterable(6);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "next," +
+         "set:b=3," +
+         "next," +
+         "next," +
+         "next," +
+         "set:c=6," +
+         "next,");
+
+reset();
+[obj.a, , obj.b, , , obj.c, ,] = createIterable(7);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "next," +
+         "set:b=3," +
+         "next," +
+         "next," +
+         "next," +
+         "set:c=6," +
+         "next,");
+
+// Rest.
+
+reset();
+[...obj.r] = createIterable(0);
+assertEq(log,
+         "next," +
+         "set:r=[],");
+
+reset();
+[...obj.r] = createIterable(1);
+assertEq(log,
+         "next," +
+         "next," +
+         "set:r=[1],");
+
+reset();
+[obj.a, ...obj.r] = createIterable(0);
+assertEq(log,
+         "next," +
+         "set:a=undefined," +
+         "set:r=[],");
+
+reset();
+[obj.a, ...obj.r] = createIterable(1);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:r=[],");
+
+reset();
+[obj.a, ...obj.r] = createIterable(2);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "next," +
+         "set:r=[2],");
+
+reset();
+[obj.a, obj.b, ...obj.r] = createIterable(0);
+assertEq(log,
+         "next," +
+         "set:a=undefined," +
+         "set:b=undefined," +
+         "set:r=[],");
+
+reset();
+[obj.a, obj.b, ...obj.r] = createIterable(1);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=undefined," +
+         "set:r=[],");
+
+reset();
+[obj.a, obj.b, ...obj.r] = createIterable(2);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=2," +
+         "next," +
+         "set:r=[],");
+
+reset();
+[obj.a, obj.b, ...obj.r] = createIterable(3);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=2," +
+         "next," +
+         "next," +
+         "set:r=[3],");
+
+// Rest and elision.
+
+reset();
+[, ...obj.r] = createIterable(0);
+assertEq(log,
+         "next," +
+         "set:r=[],");
+
+reset();
+[, ...obj.r] = createIterable(1);
+assertEq(log,
+         "next," +
+         "next," +
+         "set:r=[],");
+
+reset();
+[, ...obj.r] = createIterable(2);
+assertEq(log,
+         "next," +
+         "next," +
+         "next," +
+         "set:r=[2],");
+
+reset();
+[obj.a, obj.b, , ...obj.r] = createIterable(0);
+assertEq(log,
+         "next," +
+         "set:a=undefined," +
+         "set:b=undefined," +
+         "set:r=[],");
+
+reset();
+[obj.a, obj.b, , ...obj.r] = createIterable(1);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=undefined," +
+         "set:r=[],");
+
+reset();
+[obj.a, obj.b, , ...obj.r] = createIterable(2);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=2," +
+         "next," +
+         "set:r=[],");
+
+reset();
+[obj.a, obj.b, , ...obj.r] = createIterable(3);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=2," +
+         "next," +
+         "next," +
+         "set:r=[],");
+
+reset();
+[obj.a, obj.b, , ...obj.r] = createIterable(4);
+assertEq(log,
+         "next," +
+         "set:a=1," +
+         "next," +
+         "set:b=2," +
+         "next," +
+         "next," +
+         "next," +
+         "set:r=[4],");
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
diff --git a/js/src/tests/ecma_6/Expressions/destructuring-array-lexical.js b/js/src/tests/ecma_6/Expressions/destructuring-array-lexical.js
new file mode 100644
index 000000000..133858a09
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/destructuring-array-lexical.js
@@ -0,0 +1,12 @@
+var BUGNUMBER = 1184922;
+var summary = "Array destructuring with accessing uninitialized lexical binding.";
+
+print(BUGNUMBER + ": " + summary);
+
+assertThrowsInstanceOf(() => { let y = [y] = []; },
+                       ReferenceError);
+assertThrowsInstanceOf(() => { let y = [y] = [,]; },
+                       ReferenceError);
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
diff --git a/js/src/tests/ecma_6/Expressions/destructuring-pattern-parenthesized.js b/js/src/tests/ecma_6/Expressions/destructuring-pattern-parenthesized.js
new file mode 100644
index 000000000..ca495c886
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/destructuring-pattern-parenthesized.js
@@ -0,0 +1,140 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1146136;
+var summary =
+  'Parenthesized "destructuring patterns" are not usable as destructuring ' +
+  'patterns';
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+// Don't pollute the top-level script with eval references.
+var savedEval = this[String.fromCharCode(101, 118, 97, 108)];
+
+function checkError(code, nonstrictErr, strictErr)
+{
+  function helper(exec, prefix, err)
+  {
+    var fullCode = prefix + code;
+    try
+    {
+      var f = exec(fullCode);
+
+      var error =
+        "no early error, parsed code <" + fullCode + "> using " + exec.name;
+      if (typeof f === "function")
+      {
+        try
+        {
+          f();
+          error += ", and the function can be called without error";
+        }
+        catch (e)
+        {
+          error +=", and calling the function throws " + e;
+        }
+      }
+
+      throw new Error(error);
+    }
+    catch (e)
+    {
+      assertEq(e instanceof err, true,
+               "expected " + err.name + ", got " + e + " " +
+               "for code <" + fullCode + "> when parsed using " + exec.name);
+    }
+  }
+
+  helper(Function, "", nonstrictErr);
+  helper(Function, "'use strict'; ", strictErr);
+  helper(savedEval, "", nonstrictErr);
+  helper(savedEval, "'use strict'; ", strictErr);
+}
+
+// Parenthesized destructuring patterns don't trigger grammar refinement, so we
+// get the currently-usual ReferenceError for an invalid assignment target, per
+// 12.14.1 second bullet.
+checkError("var a, b; ([a, b]) = [1, 2];", ReferenceError, ReferenceError);
+checkError("var a, b; ({a, b}) = { a: 1, b: 2 };", ReferenceError, ReferenceError);
+
+// *Nested* parenthesized destructuring patterns, on the other hand, do trigger
+// grammar refinement.  But subtargets in a destructuring pattern must be
+// either object/array literals that match the destructuring pattern refinement
+// *or* valid simple assignment targets (or such things with a default, with the
+// entire subtarget unparenthesized: |a = 3| is fine, |(a) = 3| is fine for
+// destructuring in an expression, |(a = 3)| is forbidden).  Parenthesized
+// object/array patterns are neither.  And so 12.14.5.1 third bullet requires an
+// early SyntaxError.
+checkError("var a, b; ({ a: ({ b: b }) } = { a: { b: 42 } });", SyntaxError, SyntaxError);
+checkError("var a, b; ({ a: { b: (b = 7) } } = { a: {} });", SyntaxError, SyntaxError);
+checkError("var a, b; ({ a: ([b]) } = { a: [42] });", SyntaxError, SyntaxError);
+checkError("var a, b; [(a = 5)] = [1];", SyntaxError, SyntaxError);
+checkError("var a, b; ({ a: (b = 7)} = { b: 1 });", SyntaxError, SyntaxError);
+
+Function("var a, b; [(a), b] = [1, 2];")();
+Function("var a, b; [(a) = 5, b] = [1, 2];")();
+Function("var a, b; [(arguments), b] = [1, 2];")();
+Function("var a, b; [(arguments) = 5, b] = [1, 2];")();
+Function("var a, b; [(eval), b] = [1, 2];")();
+Function("var a, b; [(eval) = 5, b] = [1, 2];")();
+
+var repair = {}, demolition = {};
+
+Function("var a, b; [(repair.man), b] = [1, 2];")();
+Function("var a, b; [(demolition['man']) = 'motel', b] = [1, 2];")();
+Function("var a, b; [(demolition['man' + {}]) = 'motel', b] = [1, 2];")(); // evade constant-folding
+
+function classesEnabled()
+{
+  try
+  {
+    new Function("class B { constructor() { } }; class D extends B { constructor() { super(); } }");
+    return true;
+  }
+  catch (e if e instanceof SyntaxError)
+  {
+    return false;
+  }
+}
+
+if (classesEnabled())
+{
+  Function("var a, b; var obj = { x() { [(super.man), b] = [1, 2]; } };")();
+  Function("var a, b; var obj = { x() { [(super[8]) = 'motel', b] = [1, 2]; } };")();
+  Function("var a, b; var obj = { x() { [(super[8 + {}]) = 'motel', b] = [1, 2]; } };")(); // evade constant-folding
+}
+
+// As noted above, when the assignment element has an initializer, the
+// assignment element must not be parenthesized.
+checkError("var a, b; [(repair.man = 17)] = [1];", SyntaxError, SyntaxError);
+checkError("var a, b; [(demolition['man'] = 'motel')] = [1, 2];", SyntaxError, SyntaxError);
+checkError("var a, b; [(demolition['man' + {}] = 'motel')] = [1];", SyntaxError, SyntaxError); // evade constant-folding
+if (classesEnabled())
+{
+  checkError("var a, b; var obj = { x() { [(super.man = 5)] = [1]; } };", SyntaxError, SyntaxError);
+  checkError("var a, b; var obj = { x() { [(super[8] = 'motel')] = [1]; } };", SyntaxError, SyntaxError);
+  checkError("var a, b; var obj = { x() { [(super[8 + {}] = 'motel')] = [1]; } };", SyntaxError, SyntaxError); // evade constant-folding
+}
+
+// In strict mode, assignment to funcall *immediately* triggers ReferenceError
+// before we can recognize this doesn't even match the destructuring grammar to
+// begin with.  Bleh.  :-(  Probably they should all be made SyntaxError in the
+// specs; see <https://bugs.ecmascript.org/show_bug.cgi?id=4375>.
+checkError("var a, b; [f() = 'ohai', b] = [1, 2];", SyntaxError, ReferenceError);
+checkError("var a, b; [(f()) = 'kthxbai', b] = [1, 2];", SyntaxError, ReferenceError);
+
+Function("var a, b; ({ a: (a), b} = { a: 1, b: 2 });")();
+Function("var a, b; ({ a: (a) = 5, b} = { a: 1, b: 2 });")();
+
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");
diff --git a/js/src/tests/ecma_6/Expressions/object-literal-__proto__.js b/js/src/tests/ecma_6/Expressions/object-literal-__proto__.js
new file mode 100644
index 000000000..531ef7fc5
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/object-literal-__proto__.js
@@ -0,0 +1,267 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1061853;
+var summary =
+  "__proto__ in object literals in non-__proto__:v contexts doesn't modify " +
+  "[[Prototype]]";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+function hasOwn(obj, prop)
+{
+  return Object.getOwnPropertyDescriptor(obj, prop) !== undefined;
+}
+
+var objectStart = "{ ";
+var objectEnd = " }";
+
+var members =
+  {
+    nullProto: "__proto__: null",
+    functionProtoProto: "__proto__: Function.prototype",
+    computedNull:  "['__proto__']: null",
+    method: "__proto__() {}",
+    computedMethod: "['__proto__']() {}",
+    generatorMethod: "*__proto__() {}",
+    computedGenerator: "*['__proto__']() {}",
+    shorthand: "__proto__",
+    getter: "get __proto__() { return 42; }",
+    getterComputed: "get ['__proto__']() { return 42; }",
+    setter: "set __proto__(v) { }",
+    setterComputed: "set ['__proto__'](v) { }",
+  };
+
+function isProtoMutation(key)
+{
+  return key === "nullProto" || key === "functionProtoProto";
+}
+
+function isGetter(key)
+{
+  return key === "getter" || key === "getterComputed";
+}
+
+function isSetter(key)
+{
+  return key === "setter" || key === "setterComputed";
+}
+
+function isData(key)
+{
+  return !isProtoMutation(key) && !isGetter(key) && !isSetter(key);
+}
+
+var __proto__ = "string value";
+
+function typeOfProto(key)
+{
+  if (key === "computedNull")
+    return "object";
+  if (key === "method" || key === "computedMethod" ||
+      key === "computedGenerator" || key === "generatorMethod")
+  {
+    return "function";
+  }
+  if (key === "getter" || key === "getterComputed")
+    return "number";
+  assertEq(key, "shorthand", "bug in test!");
+  return "string";
+}
+
+for (var first in members)
+{
+  var fcode = "return " + objectStart + members[first] + objectEnd;
+  var f = Function(fcode);
+  var oneProp = f();
+
+  if (first === "nullProto")
+  {
+    assertEq(Object.getPrototypeOf(oneProp), null);
+    assertEq(hasOwn(oneProp, "__proto__"), false);
+  }
+  else if (first === "functionProtoProto")
+  {
+    assertEq(Object.getPrototypeOf(oneProp), Function.prototype);
+    assertEq(hasOwn(oneProp, "__proto__"), false);
+  }
+  else if (isSetter(first))
+  {
+    assertEq(Object.getPrototypeOf(oneProp), Object.prototype);
+    assertEq(hasOwn(oneProp, "__proto__"), true);
+    assertEq(typeof Object.getOwnPropertyDescriptor(oneProp, "__proto__").set,
+             "function");
+  }
+  else
+  {
+    assertEq(Object.getPrototypeOf(oneProp), Object.prototype);
+    assertEq(hasOwn(oneProp, "__proto__"), true);
+    assertEq(typeof oneProp.__proto__, typeOfProto(first));
+  }
+
+  for (var second in members)
+  {
+    try
+    {
+      var gcode = "return " + objectStart + members[first] + ", " +
+                                            members[second] + objectEnd;
+      var g = Function(gcode);
+    }
+    catch (e)
+    {
+      assertEq(e instanceof SyntaxError, true,
+               "__proto__ member conflicts should be syntax errors, got " + e);
+      assertEq(+(first === "nullProto" || first === "functionProtoProto") +
+               +(second === "nullProto" || second === "functionProtoProto") > 1,
+               true,
+               "unexpected conflict between members: " + first + ", " + second);
+      continue;
+    }
+
+    var twoProps = g();
+
+    if (first === "nullProto" || second === "nullProto")
+      assertEq(Object.getPrototypeOf(twoProps), null);
+    else if (first === "functionProtoProto" || second === "functionProtoProto")
+      assertEq(Object.getPrototypeOf(twoProps), Function.prototype);
+    else
+      assertEq(Object.getPrototypeOf(twoProps), Object.prototype);
+
+    if (isSetter(second))
+    {
+      assertEq(hasOwn(twoProps, "__proto__"), true);
+      assertEq(typeof Object.getOwnPropertyDescriptor(twoProps, "__proto__").get,
+               isGetter(first) ? "function" : "undefined");
+    }
+    else if (!isProtoMutation(second))
+    {
+      assertEq(hasOwn(twoProps, "__proto__"), true);
+      assertEq(typeof twoProps.__proto__, typeOfProto(second));
+      if (isGetter(second))
+      {
+        assertEq(typeof Object.getOwnPropertyDescriptor(twoProps, "__proto__").get,
+                 "function");
+        assertEq(typeof Object.getOwnPropertyDescriptor(twoProps, "__proto__").set,
+                 isSetter(first) ? "function" : "undefined");
+      }
+    }
+    else if (isSetter(first))
+    {
+      assertEq(hasOwn(twoProps, "__proto__"), true);
+      assertEq(typeof Object.getOwnPropertyDescriptor(twoProps, "__proto__").set,
+               "function");
+      assertEq(typeof Object.getOwnPropertyDescriptor(twoProps, "__proto__").get,
+               "undefined");
+    }
+    else if (!isProtoMutation(first))
+    {
+      assertEq(hasOwn(twoProps, "__proto__"), true);
+      assertEq(typeof twoProps.__proto__, typeOfProto(first));
+    }
+    else
+    {
+      assertEq(true, false, "should be unreachable: " + first + ", " + second);
+    }
+
+    for (var third in members)
+    {
+      try
+      {
+        var hcode = "return " + objectStart + members[first] + ", " +
+                                              members[second] + ", " +
+                                              members[third] + objectEnd;
+        var h = Function(hcode);
+      }
+      catch (e)
+      {
+        assertEq(e instanceof SyntaxError, true,
+                 "__proto__ member conflicts should be syntax errors, got " + e);
+        assertEq(+(first === "nullProto" || first === "functionProtoProto") +
+                 +(second === "nullProto" || second === "functionProtoProto") +
+                 +(third === "nullProto" || third === "functionProtoProto") > 1,
+                 true,
+                 "unexpected conflict among members: " +
+                 first + ", " + second + ", " + third);
+        continue;
+      }
+
+      var threeProps = h();
+
+      if (first === "nullProto" || second === "nullProto" ||
+          third === "nullProto")
+      {
+        assertEq(Object.getPrototypeOf(threeProps), null);
+      }
+      else if (first === "functionProtoProto" ||
+               second === "functionProtoProto" ||
+               third === "functionProtoProto")
+      {
+        assertEq(Object.getPrototypeOf(threeProps), Function.prototype);
+      }
+      else
+      {
+        assertEq(Object.getPrototypeOf(threeProps), Object.prototype);
+      }
+
+      if (isSetter(third))
+      {
+        assertEq(hasOwn(threeProps, "__proto__"), true);
+        assertEq(typeof Object.getOwnPropertyDescriptor(threeProps, "__proto__").get,
+                 isGetter(second) || (!isData(second) && isGetter(first))
+                 ? "function"
+                 : "undefined",
+                 "\n" + hcode);
+      }
+      else if (!isProtoMutation(third))
+      {
+        assertEq(hasOwn(threeProps, "__proto__"), true);
+        assertEq(typeof threeProps.__proto__, typeOfProto(third), first + ", " + second + ", " +  third);
+        if (isGetter(third))
+        {
+          var desc = Object.getOwnPropertyDescriptor(threeProps, "__proto__");
+          assertEq(typeof desc.get, "function");
+          assertEq(typeof desc.set,
+                   isSetter(second) || (!isData(second) && isSetter(first))
+                   ? "function"
+                   : "undefined");
+        }
+      }
+      else if (isSetter(second))
+      {
+        assertEq(hasOwn(threeProps, "__proto__"), true);
+        assertEq(typeof Object.getOwnPropertyDescriptor(threeProps, "__proto__").get,
+                 isGetter(first) ? "function" : "undefined");
+      }
+      else if (!isProtoMutation(second))
+      {
+        assertEq(hasOwn(threeProps, "__proto__"), true);
+        assertEq(typeof threeProps.__proto__, typeOfProto(second));
+        if (isGetter(second))
+        {
+          var desc = Object.getOwnPropertyDescriptor(threeProps, "__proto__");
+          assertEq(typeof desc.get, "function");
+          assertEq(typeof desc.set,
+                   isSetter(first) ? "function" : "undefined");
+        }
+      }
+      else
+      {
+        assertEq(true, false,
+                 "should be unreachable: " +
+                 first + ", " + second + ", " + third);
+      }
+    }
+  }
+}
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");
diff --git a/js/src/tests/ecma_6/Expressions/object-literal-computed-property-evaluation.js b/js/src/tests/ecma_6/Expressions/object-literal-computed-property-evaluation.js
new file mode 100644
index 000000000..d26783d35
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/object-literal-computed-property-evaluation.js
@@ -0,0 +1,38 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1199546;
+var summary =
+  "Convert computed property name expressions to property key before " +
+  "evaluating the property's value";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var s = "foo";
+var convertsToS = { toString() { return s; } };
+
+var o = {
+  [convertsToS]: // after ToPropertyKey becomes "foo"
+    (function() {
+      s = 'bar';
+      return 'abc'; // so we have "foo": "bar" for the first property
+     })(),
+
+  [convertsToS]: // |s| was set above to "bar", so after ToPropertyKey, "bar"
+    'efg' // so we have "bar": "efg" for the second property
+};
+
+assertEq(o.foo, "abc");
+assertEq(o.bar, "efg");
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");
diff --git a/js/src/tests/ecma_6/Expressions/octal-literals.js b/js/src/tests/ecma_6/Expressions/octal-literals.js
new file mode 100644
index 000000000..abeef8736
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/octal-literals.js
@@ -0,0 +1,103 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 894026;
+var summary = "Implement ES6 octal literals";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var chars = ['o', 'O'];
+
+for (var i = 0; i < 8; i++)
+{
+  if (i === 8)
+  {
+    chars.forEach(function(v)
+    {
+      try
+      {
+        eval('0' + v + i);
+        throw "didn't throw";
+      }
+      catch (e)
+      {
+        assertEq(e instanceof SyntaxError, true,
+                 "no syntax error evaluating 0" + v + i + ", " +
+                 "got " + e);
+      }
+    });
+    continue;
+  }
+
+  for (var j = 0; j < 8; j++)
+  {
+    if (j === 8)
+    {
+      chars.forEach(function(v)
+      {
+        try
+        {
+          eval('0' + v + i + j);
+          throw "didn't throw";
+        }
+        catch (e)
+        {
+          assertEq(e instanceof SyntaxError, true,
+                   "no syntax error evaluating 0" + v + i + j + ", " +
+                   "got " + e);
+        }
+      });
+      continue;
+    }
+
+    for (var k = 0; k < 8; k++)
+    {
+      if (k === 8)
+      {
+        chars.forEach(function(v)
+        {
+          try
+          {
+            eval('0' + v + i + j + k);
+            throw "didn't throw";
+          }
+          catch (e)
+          {
+            assertEq(e instanceof SyntaxError, true,
+                     "no syntax error evaluating 0" + v + i + j + k + ", " +
+                     "got " + e);
+          }
+        });
+        continue;
+      }
+
+      chars.forEach(function(v)
+      {
+        assertEq(eval('0' + v + i + j + k), i * 64 + j * 8 + k);
+      });
+    }
+  }
+}
+
+// Off-by-one check: '/' immediately precedes '0'.
+assertEq(0o110/2, 36);
+assertEq(0O644/2, 210);
+
+function strict()
+{
+  "use strict";
+  return 0o755;
+}
+assertEq(strict(), 7 * 64 + 5 * 8 + 5);
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");
diff --git a/js/src/tests/ecma_6/Expressions/shell.js b/js/src/tests/ecma_6/Expressions/shell.js
new file mode 100644
index 000000000..0a0a24656
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/shell.js
@@ -0,0 +1,186 @@
+(function(global) {
+    function func() {
+    }
+    class C {
+        foo() {
+        }
+        static foo() {
+        }
+    }
+
+    function test_one(pattern, val, opt) {
+        var stmts = [];
+        var i = 0;
+        var c;
+
+        stmts.push(`var ${pattern} = ${val};`);
+        if (!opt.no_comp) {
+            stmts.push(`[for (x of [1]) ${pattern} = ${val}];`);
+            stmts.push(`[...(for (x of [1]) ${pattern} = ${val})];`);
+        }
+
+        for (var stmt of stmts) {
+            if (!opt.no_plain) {
+                eval(`
+${stmt}
+`);
+            }
+
+            if (!opt.no_func) {
+                eval(`
+function f${i}() {
+  ${stmt}
+}
+f${i}();
+`);
+                i++;
+
+                eval(`
+var f${i} = function foo() {
+  ${stmt}
+};
+f${i}();
+`);
+                i++;
+
+                eval(`
+var f${i} = () => {
+  ${stmt}
+};
+f${i}();
+`);
+                i++;
+            }
+
+            if (!opt.no_gen) {
+                eval(`
+function* g${i}() {
+  ${stmt}
+}
+[...g${i}()];
+`);
+                i++;
+
+                eval(`
+var g${i} = function* foo() {
+  ${stmt}
+};
+[...g${i}()];
+`);
+                i++;
+            }
+
+            if (!opt.no_ctor) {
+                eval(`
+class D${i} {
+  constructor() {
+    ${stmt}
+  }
+}
+new D${i}();
+`);
+                i++;
+            }
+
+            if (!opt.no_derived_ctor) {
+                if (opt.no_pre_super) {
+                    eval(`
+class D${i} extends C {
+  constructor() {
+    ${stmt}
+    try { super(); } catch (e) {}
+  }
+}
+new D${i}();
+`);
+                    i++;
+                } else {
+                    eval(`
+class D${i} extends C {
+  constructor() {
+    super();
+    ${stmt}
+  }
+}
+new D${i}();
+`);
+                    i++;
+                }
+            }
+
+            if (!opt.no_method) {
+                eval(`
+class D${i} extends C {
+  method() {
+    ${stmt}
+  }
+  static staticMethod() {
+    ${stmt}
+  }
+}
+new D${i}().method();
+D${i}.staticMethod();
+`);
+                i++;
+            }
+        }
+
+        if (!opt.no_func_arg) {
+            eval(`
+function f${i}(${pattern}) {}
+f${i}(${val});
+`);
+            i++;
+
+            eval(`
+var f${i} = function foo(${pattern}) {};
+f${i}(${val});
+`);
+            i++;
+
+            eval(`
+var f${i} = (${pattern}) => {};
+f${i}(${val});
+`);
+            i++;
+        }
+
+        if (!opt.no_gen_arg) {
+            eval(`
+function* g${i}(${pattern}) {}
+[...g${i}(${val})];
+`);
+            i++;
+
+            eval(`
+var g${i} = function* foo(${pattern}) {};
+[...g${i}(${val})];
+`);
+            i++;
+        }
+    }
+
+    function test(expr, opt={}) {
+        var pattern = `[a=${expr}, ...c]`;
+        test_one(pattern, "[]", opt);
+        test_one(pattern, "[1]", opt);
+
+        pattern = `[,a=${expr}]`;
+        test_one(pattern, "[]", opt);
+        test_one(pattern, "[1]", opt);
+        test_one(pattern, "[1, 2]", opt);
+
+        pattern = `[{x: [a=${expr}]}]`;
+        test_one(pattern, "[{x: [1]}]", opt);
+
+        pattern = `[x=[a=${expr}]=[]]`;
+        test_one(pattern, "[]", opt);
+        test_one(pattern, "[1]", opt);
+
+        pattern = `[x=[a=${expr}]=[1]]`;
+        test_one(pattern, "[]", opt);
+        test_one(pattern, "[1]", opt);
+    }
+
+    global.testDestructuringArrayDefault = test;
+})(this);
diff --git a/js/src/tests/ecma_6/Expressions/tagged-template-constant-folding.js b/js/src/tests/ecma_6/Expressions/tagged-template-constant-folding.js
new file mode 100644
index 000000000..6041cbc16
--- /dev/null
+++ b/js/src/tests/ecma_6/Expressions/tagged-template-constant-folding.js
@@ -0,0 +1,28 @@
+// Any copyright is dedicated to the Public Domain.
+// http://creativecommons.org/licenses/publicdomain/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 1182373;
+var summary =
+  "Don't let constant-folding in the MemberExpression part of a tagged " +
+  "template cause an incorrect |this| be passed to the callee";
+
+print(BUGNUMBER + ": " + summary);
+
+/**************
+ * BEGIN TEST *
+ **************/
+
+var prop = "global";
+
+var obj = { prop: "obj", f: function() { return this.prop; } };
+
+assertEq(obj.f``, "obj");
+assertEq((true ? obj.f : null)``, "global");
+
+/******************************************************************************/
+
+if (typeof reportCompare === "function")
+  reportCompare(true, true);
+
+print("Tests complete");