--- a/nashorn/src/jdk/nashorn/internal/codegen/Attr.java	Fri May 31 12:57:44 2013 +0200
+++ b/nashorn/src/jdk/nashorn/internal/codegen/Attr.java	Fri May 31 12:58:02 2013 +0200
@@ -84,13 +84,12 @@
 import jdk.nashorn.internal.ir.UnaryNode;
 import jdk.nashorn.internal.ir.VarNode;
 import jdk.nashorn.internal.ir.WithNode;
+import jdk.nashorn.internal.ir.visitor.NodeOperatorVisitor;
 import jdk.nashorn.internal.ir.visitor.NodeVisitor;
-import jdk.nashorn.internal.ir.visitor.NodeOperatorVisitor;
 import jdk.nashorn.internal.parser.TokenType;
 import jdk.nashorn.internal.runtime.Context;
 import jdk.nashorn.internal.runtime.Debug;
 import jdk.nashorn.internal.runtime.DebugLogger;
-import jdk.nashorn.internal.runtime.ECMAException;
 import jdk.nashorn.internal.runtime.JSType;
 import jdk.nashorn.internal.runtime.Property;
 import jdk.nashorn.internal.runtime.PropertyMap;
@@ -1323,7 +1322,7 @@
     @Override
     public Node leaveForNode(final ForNode forNode) {
         if (forNode.isForIn()) {
-            forNode.setIterator(newInternal(lc.getCurrentFunction().uniqueName(ITERATOR_PREFIX.symbolName()), Type.OBJECT)); //NASHORN-73
+            forNode.setIterator(newInternal(lc.getCurrentFunction().uniqueName(ITERATOR_PREFIX.symbolName()), Type.typeFor(ITERATOR_PREFIX.type()))); //NASHORN-73
             /*
              * Iterators return objects, so we need to widen the scope of the
              * init variable if it, for example, has been assigned double type
@@ -1500,7 +1499,7 @@
     }
 
     private Symbol exceptionSymbol() {
-        return newInternal(lc.getCurrentFunction().uniqueName(EXCEPTION_PREFIX.symbolName()), Type.typeFor(ECMAException.class));
+        return newInternal(lc.getCurrentFunction().uniqueName(EXCEPTION_PREFIX.symbolName()), Type.typeFor(EXCEPTION_PREFIX.type()));
     }
 
     /**

--- a/nashorn/src/jdk/nashorn/internal/codegen/CompilerConstants.java	Fri May 31 12:57:44 2013 +0200
+++ b/nashorn/src/jdk/nashorn/internal/codegen/CompilerConstants.java	Fri May 31 12:58:02 2013 +0200
@@ -29,6 +29,7 @@
 
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
+import java.util.Iterator;
 import jdk.nashorn.internal.codegen.types.Type;
 import jdk.nashorn.internal.runtime.ScriptFunction;
 import jdk.nashorn.internal.runtime.ScriptObject;
@@ -105,13 +106,13 @@
     ARGUMENTS("arguments", Object.class, 2),
 
     /** prefix for iterators for for (x in ...) */
-    ITERATOR_PREFIX(":i"),
+    ITERATOR_PREFIX(":i", Iterator.class),
 
     /** prefix for tag variable used for switch evaluation */
     SWITCH_TAG_PREFIX(":s"),
 
     /** prefix for all exceptions */
-    EXCEPTION_PREFIX(":e"),
+    EXCEPTION_PREFIX(":e", Throwable.class),
 
     /** prefix for quick slots generated in Store */
     QUICK_PREFIX(":q"),