diff --git a/mozilla/js/tests/js1_7/decompilation/regress-352022.js b/mozilla/js/tests/js1_7/decompilation/regress-352022.js
index 02d36d506e4..a7b99070438 100755
--- a/mozilla/js/tests/js1_7/decompilation/regress-352022.js
+++ b/mozilla/js/tests/js1_7/decompilation/regress-352022.js
@@ -58,12 +58,12 @@ function test()
   f = function() { g(h) = (delete let (y) 3); }
   actual = f + '';
   expect = 'function () {\n    g(h) = ((let (y) 3), true);\n}';
-  compareSource(expect, actual, summary);
+  compareSource(expect, actual, summary + ': 1');
 
   f = function () {    g(h) = ((let (y) 3), true);}
   actual = f + '';
   expect = 'function () {\n    g(h) = ((let (y) 3), true);\n}';
-  compareSource(expect, actual, summary);
+  compareSource(expect, actual, summary + ': 2');
 
   exitFunc ('test');
 }
diff --git a/mozilla/js/tests/js1_8_1/decompilation/regress-349605.js b/mozilla/js/tests/js1_8_1/decompilation/regress-349605.js
index 0ddf65ba9eb..c6e22a2e280 100755
--- a/mozilla/js/tests/js1_8_1/decompilation/regress-349605.js
+++ b/mozilla/js/tests/js1_8_1/decompilation/regress-349605.js
@@ -56,7 +56,7 @@ function test()
     { alert(1); for((let(y=3) let(y=4) y); 0; x++) ; alert(6); }
 
   expect = 'function () {\n    alert(1);\n' +
-    '    for ((let (y = 3) (let (y = 4) y)); false; x++) {\n' +
+    '    for (let (y = 3) let (y = 4) y; false; x++) {\n' +
     '    }\n' +
     '    alert(6);\n' +
     '}';
diff --git a/mozilla/js/tests/js1_8_1/decompilation/regress-350991.js b/mozilla/js/tests/js1_8_1/decompilation/regress-350991.js
new file mode 100755
index 00000000000..9f0d5cd4006
--- /dev/null
+++ b/mozilla/js/tests/js1_8_1/decompilation/regress-350991.js
@@ -0,0 +1,87 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript Engine testing utilities.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Jesse Ruderman
+ *                 Jeff Walden
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+var gTestfile = 'regress-350991.js';
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 350991;
+var summary = 'decompilation of function () { for (let...;...;}} ';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+
+  var f;
+
+  expect = 'function () {\n    for (let (y) 3;;) {\n    }\n}';
+  try
+  {
+    f = eval('(function () { for ((let (y) 3); ;) { } })');
+    actual = f + '';
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+
+  compareSource(expect, actual, summary);
+
+  expect = 'function () {\n    let x = 5;\n    while (x-- > 0) {\n' +
+    '        for (let x = x, q = 5;;) {\n        }\n    }\n}';
+  try
+  {
+    f = function() { let x = 5; while (x-- > 0) { for (let x = x, q = 5;;); } }
+    actual = f + '';
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+
+  compareSource(expect, actual, summary);
+
+  exitFunc ('test');
+}
diff --git a/mozilla/js/tests/js1_8_1/decompilation/regress-352011.js b/mozilla/js/tests/js1_8_1/decompilation/regress-352011.js
new file mode 100755
index 00000000000..9c377f77608
--- /dev/null
+++ b/mozilla/js/tests/js1_8_1/decompilation/regress-352011.js
@@ -0,0 +1,75 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript Engine testing utilities.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Brendan Eich
+ *                 Jesse Ruderman
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+var gTestfile = 'regress-352011.js';
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 352011;
+var summary = 'decompilation of statements that begin with object literals';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  var f;
+
+  f = function() { ({}.y = i); }
+  expect = 'function() { ({}.y = i); }';
+  actual = f + '';
+  compareSource(expect, actual, summary);
+
+  f = function() { let(x) ({t:x}) }
+  expect = 'function() { let(x) ({t:x}); }';
+  actual = f + '';
+  compareSource(expect, actual, summary);
+
+  f = function() { (let(x) {y: z}) }
+  expect = 'function() { let(x) ({y: z}); }';
+  actual = f + '';
+  compareSource(expect, actual, summary);
+
+  exitFunc ('test');
+}
diff --git a/mozilla/js/tests/js1_8_1/decompilation/regress-352022.js b/mozilla/js/tests/js1_8_1/decompilation/regress-352022.js
new file mode 100755
index 00000000000..69a5547d72e
--- /dev/null
+++ b/mozilla/js/tests/js1_8_1/decompilation/regress-352022.js
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript Engine testing utilities.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Jesse Ruderman
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+var gTestfile = 'regress-352022.js';
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 352022;
+var summary = 'decompilation of let, delete and parens';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  var f;
+
+  f = function() { g(h) = (delete let (y) 3); }
+  actual = f + '';
+  expect = 'function () {\n    g(h) = (let (y) 3, true);\n}';
+  compareSource(expect, actual, summary + ': 1');
+
+  f = function () {    g(h) = ((let (y) 3), true);}
+  actual = f + '';
+  expect = 'function () {\n    g(h) = (let (y) 3, true);\n}';
+  compareSource(expect, actual, summary + ': 2');
+
+  exitFunc ('test');
+}
diff --git a/mozilla/js/tests/js1_8_1/decompilation/regress-352026.js b/mozilla/js/tests/js1_8_1/decompilation/regress-352026.js
index dfc5a9c5028..e3bedc144eb 100755
--- a/mozilla/js/tests/js1_8_1/decompilation/regress-352026.js
+++ b/mozilla/js/tests/js1_8_1/decompilation/regress-352026.js
@@ -61,7 +61,7 @@ function test()
   compareSource(expect, actual, summary);
 
   f = function f(){g((let(a=b)c,d),e)}
-  expect = 'function f(){g(((let(a=b)c),d),e);}';
+  expect = 'function f(){g((let(a=b)c,d),e);}';
   actual = f + '';
   compareSource(expect, actual, summary);
 
@@ -71,7 +71,7 @@ function test()
   compareSource(expect, actual, summary);
 
   f = function() { (let(s=4){foo:"bar"}) }
-  expect = 'function() { (let(s=4)({foo:"bar"})); }';
+  expect = 'function() { let(s=4)({foo:"bar"}); }';
   actual = f + '';
   compareSource(expect, actual, summary);
 
diff --git a/mozilla/js/tests/js1_8_1/decompilation/regress-352609.js b/mozilla/js/tests/js1_8_1/decompilation/regress-352609.js
new file mode 100755
index 00000000000..58a4960d311
--- /dev/null
+++ b/mozilla/js/tests/js1_8_1/decompilation/regress-352609.js
@@ -0,0 +1,90 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript Engine testing utilities.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Jesse Ruderman
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+var gTestfile = 'regress-352609.js';
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 352609;
+var summary = 'decompilation of |let| expression for |is not a function| error';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+
+  expect = /TypeError: 0 is not a function/;
+  try
+  {
+    [let (x = 3, y = 4) x].map(0);
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+  reportMatch(expect, actual, '[let (x = 3, y = 4) x].map(0)');
+
+  expect = /TypeError: (p.z = \[let \(x = 3, y = 4\) x\]|.*Array.*) is not a function/;
+  try
+  {
+    var p = {}; (p.z = [let (x = 3, y = 4) x])();
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+  reportMatch(expect, actual, 'p = {}; (p.z = [let (x = 3, y = 4) x])()');
+
+  expect = /TypeError: (p.z = let \(x\) x|.*Undefined.*) is not a function/;
+  try
+  {
+    var p = {}; (p.z = let(x) x)()
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+  reportMatch(expect, actual, 'p = {}; (p.z = let(x) x)()');
+
+  exitFunc ('test');
+}
diff --git a/mozilla/js/tests/js1_8_1/decompilation/regress-353249.js b/mozilla/js/tests/js1_8_1/decompilation/regress-353249.js
new file mode 100755
index 00000000000..242aead45ae
--- /dev/null
+++ b/mozilla/js/tests/js1_8_1/decompilation/regress-353249.js
@@ -0,0 +1,67 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript Engine testing utilities.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2006
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Jesse Ruderman
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+var gTestfile = 'regress-353249.js';
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 353249;
+var summary = 'regression test for bug 353249';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  var f = (function () { let (x) <x/>.(1) < let (z) eval('3');
+	     for (x in this) {} });
+
+  expect = 'function () { let (x) <x/>.((1)) < (let (z) eval("3")); ' +
+    'for (x in this) {} }';
+  actual = f + '';
+  compareSource(expect, actual, summary);
+
+  // do not crash()
+  f();
+  exitFunc ('test');
+}
diff --git a/mozilla/js/tests/js1_8_1/regress/browser.js b/mozilla/js/tests/js1_8_1/regress/browser.js
new file mode 100644
index 00000000000..e69de29bb2d
diff --git a/mozilla/js/tests/js1_8_1/regress/regress-420399.js b/mozilla/js/tests/js1_8_1/regress/regress-420399.js
new file mode 100755
index 00000000000..8899c9ffe3b
--- /dev/null
+++ b/mozilla/js/tests/js1_8_1/regress/regress-420399.js
@@ -0,0 +1,69 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is JavaScript Engine testing utilities.
+ *
+ * The Initial Developer of the Original Code is
+ * Mozilla Foundation.
+ * Portions created by the Initial Developer are Copyright (C) 2007
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s): Jesse Ruderman
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+var gTestfile = 'regress-420399.js';
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 420399;
+var summary = 'Let expression error involving undefined';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  expect = /TypeError: let \(a = undefined\) a (is undefined|has no properties)/;
+  try
+  {
+    (let (a=undefined) a).b = 3;
+  }
+  catch(ex)
+  {
+    actual = ex + '';
+  }
+
+  reportMatch(expect, actual, summary);
+
+  exitFunc ('test');
+}
diff --git a/mozilla/js/tests/js1_8_1/regress/shell.js b/mozilla/js/tests/js1_8_1/regress/shell.js
new file mode 100644
index 00000000000..448e85acfe6
--- /dev/null
+++ b/mozilla/js/tests/js1_8_1/regress/shell.js
@@ -0,0 +1 @@
+gTestsubsuite='regress';
diff --git a/mozilla/js/tests/spidermonkey-n-1.9.1.tests b/mozilla/js/tests/spidermonkey-n-1.9.1.tests
index a49cf471819..a349ad6c27c 100755
--- a/mozilla/js/tests/spidermonkey-n-1.9.1.tests
+++ b/mozilla/js/tests/spidermonkey-n-1.9.1.tests
@@ -134,3 +134,11 @@ js1_7/decompilation/regress-352026.js
 # https://bugzilla.mozilla.org/show_bug.cgi?id=458851#c7
 js1_5/extensions/regress-437288-01.js
 js1_5/decompilation/regress-437288-02.js
+# more decompilation changes, bug 461233
+js1_7/block/regress-352609.js
+js1_7/decompilation/regress-349602.js
+js1_7/decompilation/regress-350991.js
+js1_7/decompilation/regress-352011.js
+js1_7/decompilation/regress-352022.js
+js1_7/extensions/regress-353249.js
+js1_7/regress/regress-420399.js