--- a/nashorn/src/jdk/nashorn/internal/codegen/CodeGenerator.java	Thu Jul 03 11:18:38 2014 +0200
+++ b/nashorn/src/jdk/nashorn/internal/codegen/CodeGenerator.java	Thu Jul 03 16:15:33 2014 +0200
@@ -1181,7 +1181,12 @@
             return;
         }
         assert count > 0; // together with count == 0 check, asserts nonnegative count
-        assert method.hasScope();
+        if (!method.hasScope()) {
+            // We can sometimes invoke this method even if the method has no slot for the scope object. Typical example:
+            // for(;;) { with({}) { break; } }. WithNode normally creates a scope, but if it uses no identifiers and
+            // nothing else forces creation of a scope in the method, we just won't have the :scope local variable.
+            return;
+        }
         method.loadCompilerConstant(SCOPE);
         for(int i = 0; i < count; ++i) {
             method.invoke(ScriptObject.GET_PROTO);

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/nashorn/test/script/basic/JDK-8047166.js	Thu Jul 03 16:15:33 2014 +0200
@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2010, 2014, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ * 
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ * 
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ * 
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+/**
+ * JDK-8047166: 'do with({}) break ; while(0);' crashes in CodeGenerator
+ *
+ * @test
+ * @run
+ */
+
+(function(){do with({}) break ; while(0);})();