1 files changed, 65 insertions, 0 deletions
diff --git a/js/src/tests/non262/extensions/regress-351070-02.js b/js/src/tests/non262/extensions/regress-351070-02.js
new file mode 100644
index 0000000000..ec288d859d
--- /dev/null
+++ b/js/src/tests/non262/extensions/regress-351070-02.js
@@ -0,0 +1,65 @@
+/* -*- indent-tabs-mode: nil; js-indent-level: 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 = 351070;
+var summary = 'decompilation of let declaration should not change scope';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  try
+  {
+    var pfx  = "(function f() { var n = 2, a = 2; ",
+      decl = " let a = 3;",
+      end  = " return a; })";
+
+    var table = [
+      ["if (!!true)",       ""],
+      ["if (!!true)",       " else foopy();"],
+      ["if (!true); else",  ""],
+      ["do ",               " while (false);"],
+      ["while (--n)",       ""],
+      ["for (--n;n;--n)",   ""],
+      ["for (a in this)",   ""],
+      ["with (this)",       ""],
+      ];
+
+    expect = 3;
+
+    for (i = 0; i < table.length; i++) {
+      var src = pfx + table[i][0] + decl + table[i][1] + end;
+      print('src: ' + src);
+      var fun = eval(src);
+      var testval = fun();
+      reportCompare(expect, testval, summary + ': ' + src);
+      if (testval != expect) {
+        break;
+      }
+      var declsrc = '(' +
+        src.slice(1, -1).replace('function f', 'function f' + i) + ')';
+      print('declsrc: ' + declsrc);
+      this['f' + i] = eval(declsrc);
+      print('f' + i + ': ' + this['f' + i]);
+    }
+  }
+  catch(ex)
+  {
+    // See https://bugzilla.mozilla.org/show_bug.cgi?id=408957
+    summary = 'let declaration must be direct child of block or top-level implicit block';
+    expect = 'SyntaxError';
+    actual = ex.name;
+    reportCompare(expect, actual, summary);
+  }
+}