--- a/js/src/frontend/Parser.cpp
+++ b/js/src/frontend/Parser.cpp
@@ -860,18 +860,25 @@ Parser<FullParseHandler>::standaloneFunc
     if (!tokenStream.matchToken(TOK_EOF)) {
         report(ParseError, false, null(), JSMSG_SYNTAX_ERROR);
         return null();
     }
 
     if (!FoldConstants(context, &pn, this))
         return null();
 
-    InternalHandle<Bindings*> bindings(script, &script->bindings);
-    if (!funpc.generateFunctionBindings(context, bindings))
+    InternalHandle<Bindings*> scriptBindings(script, &script->bindings);
+    if (!funpc.generateFunctionBindings(context, scriptBindings))
+        return null();
+
+    // Also populate the internal bindings of the function box, so that
+    // heavyweight tests while emitting bytecode work.
+    InternalHandle<Bindings*> funboxBindings =
+        InternalHandle<Bindings*>::fromMarkedLocation(&(*funbox)->bindings);
+    if (!funpc.generateFunctionBindings(context, funboxBindings))
         return null();
 
     return pn;
 }
 
 template <>
 bool
 Parser<FullParseHandler>::checkFunctionArguments()

new file mode 100644
--- /dev/null
+++ b/js/src/jit-test/tests/basic/bug886803.js
@@ -0,0 +1,3 @@
+
+f = Function("with({}) { var i; }");
+f();