diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/extensions/regress-346494-01.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/extensions/regress-346494-01.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,90 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 346494;
+var summary = 'various try...catch tests';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  var pfx = "(function (x) {try {throw x}",
+    cg1 = " catch (e if e === 42) {var v = 'catch guard 1 ' + e; actual += v + ','; print(v);}"
+    cg2 = " catch (e if e === 43) {var v = 'catch guard 2 ' + e; actual += v + ','; print(v);}"
+    cat = " catch (e) {var v = 'catch all ' + e; actual += v + ','; print(v);}"
+    fin = " finally{var v = 'fin'; actual += v + ','; print(v)}",
+    end = "})";
+
+  var exphash = {
+    pfx: "(function (y) { var result = ''; y = y + ',';",
+    cg1: "result += (y === '42,') ? ('catch guard 1 ' + y):'';",
+    cg2: "result += (y === '43,') ? ('catch guard 2 ' + y):'';",
+    cat: "result += /catch guard/.test(result) ? '': ('catch all ' + y);",
+    fin: "result += 'fin,';",
+    end: "return result;})"
+  };
+
+  var src = [
+    pfx + fin + end,
+    pfx + cat + end,
+    pfx + cat + fin + end,
+    pfx + cg1 + end,
+    pfx + cg1 + fin + end,
+    pfx + cg1 + cat + end,
+    pfx + cg1 + cat + fin + end,
+    pfx + cg1 + cg2 + end,
+    pfx + cg1 + cg2 + fin + end,
+    pfx + cg1 + cg2 + cat + end,
+    pfx + cg1 + cg2 + cat + fin + end,
+    ];
+
+  var expsrc = [
+    exphash.pfx + exphash.fin + exphash.end,
+    exphash.pfx + exphash.cat + exphash.end,
+    exphash.pfx + exphash.cat + exphash.fin + exphash.end,
+    exphash.pfx + exphash.cg1 + exphash.end,
+    exphash.pfx + exphash.cg1 + exphash.fin + exphash.end,
+    exphash.pfx + exphash.cg1 + exphash.cat + exphash.end,
+    exphash.pfx + exphash.cg1 + exphash.cat + exphash.fin + exphash.end,
+    exphash.pfx + exphash.cg1 + exphash.cg2 + exphash.end,
+    exphash.pfx + exphash.cg1 + exphash.cg2 + exphash.fin + exphash.end,
+    exphash.pfx + exphash.cg1 + exphash.cg2 + exphash.cat + exphash.end,
+    exphash.pfx + exphash.cg1 + exphash.cg2 + exphash.cat + exphash.fin + exphash.end,
+    ];
+
+  for (var i in src) {
+    print("\n=== " + src[i]);
+    var f = eval(src[i]);
+    print(src[i]);
+    var exp = eval(expsrc[i]);
+    // dis(f);
+    print('decompiling: ' + f);
+
+    actual = '';
+    try { expect = exp(42); f(42) } catch (e) { print('tried f(42), caught ' + e) }
+    reportCompare(expect, actual, summary);
+
+    actual = '';
+    try { expect = exp(43); f(43) } catch (e) { print('tried f(43), caught ' + e) }
+    reportCompare(expect, actual, summary);
+
+    actual = '';
+    try { expect = exp(44); f(44) } catch (e) { print('tried f(44), caught ' + e) }
+    reportCompare(expect, actual, summary);
+  }
+
+
+  exitFunc ('test');
+}