From 9c56bfaed476fa7d8f1cfbfe6abc86165747b199 Mon Sep 17 00:00:00 2001
From: Gary Kwong <gary@rumblingedge.com>
Date: Mon, 23 Jul 2012 13:39:18 -0700
Subject: [PATCH] Bug 776191 - Add missing case of 'with' deoptimization,
 r=dvander

---
 js/src/frontend/Parser.cpp                   | 5 +----
 js/src/jit-test/tests/basic/testBug776191.js | 7 +++++++
 2 files changed, 8 insertions(+), 4 deletions(-)
 create mode 100644 js/src/jit-test/tests/basic/testBug776191.js

diff --git a/js/src/frontend/Parser.cpp b/js/src/frontend/Parser.cpp
index f963f50f0a4..2bab5044322 100644
--- a/js/src/frontend/Parser.cpp
+++ b/js/src/frontend/Parser.cpp
@@ -1132,11 +1132,8 @@ LeaveFunction(ParseNode *fn, Parser *parser, PropertyName *funName = NULL,
              * by eval and function statements (which both flag the function as
              * having an extensible scope) or any enclosing 'with'.
              */
-            if (funtc->sc->funHasExtensibleScope() ||
-                (outer_dn && tc->innermostWith &&
-                 outer_dn->pn_pos < tc->innermostWith->pn_pos)) {
+            if (funtc->sc->funHasExtensibleScope() || tc->innermostWith)
                 DeoptimizeUsesWithin(dn, fn->pn_pos);
-            }
 
             if (!outer_dn) {
                 AtomDefnAddPtr p = tc->lexdeps->lookupForAdd(atom);
diff --git a/js/src/jit-test/tests/basic/testBug776191.js b/js/src/jit-test/tests/basic/testBug776191.js
new file mode 100644
index 00000000000..c821cf84c8b
--- /dev/null
+++ b/js/src/jit-test/tests/basic/testBug776191.js
@@ -0,0 +1,7 @@
+(function() {
+    let(a, b, c) {
+        ((function() {
+            with({}) let(b) { ((function() { c = 0 })()) }
+        })())
+    }
+})()