diff --git a/src/main/java/cpw/mods/fml/common/functions/CollectionWrapperFactory.java b/src/main/java/cpw/mods/fml/common/functions/CollectionWrapperFactory.java
new file mode 100644
index 0000000..5d026c2
--- /dev/null
+++ b/src/main/java/cpw/mods/fml/common/functions/CollectionWrapperFactory.java
@@ -0,0 +1,32 @@
+package cpw.mods.fml.common.functions;
+
+import java.util.Collection;
+import java.util.List;
+import com.google.common.collect.Collections2;
+import com.google.common.collect.Lists;
+
+public class CollectionWrapperFactory {
+	/**
+	 * Return a read only cast view of the supplied ungeneric collection, based on the element type given
+	 * @param coll The collection to cast
+	 * @param elementType the supertype contained in the collection
+	 * @return a collection asserting that type relationship
+	 */
+	public static <T> Collection<T> wrap(@SuppressWarnings("rawtypes") Collection coll, Class<T> elementType)
+	{
+		Collection<?> asGeneric = coll;
+		return Collections2.transform(asGeneric, new TypeCastFunction<T>(elementType));
+	}
+
+	/**
+	 * Return a read only cast view of the supplied ungeneric list, based on the element type given
+	 * @param list The list to cast
+	 * @param elementType the supertype contained in the list
+	 * @return a list asserting that type relationship
+	 */
+	public static <T> List<T> wrap(@SuppressWarnings("rawtypes") List list, Class<T> elementType)
+	{
+		List<?> asGeneric = list;
+		return Lists.transform(asGeneric, new TypeCastFunction<T>(elementType));
+	}
+}
\ No newline at end of file
diff --git a/src/main/java/cpw/mods/fml/common/registry/FMLControlledNamespacedRegistry.java b/src/main/java/cpw/mods/fml/common/registry/FMLControlledNamespacedRegistry.java
index 28bdbac..a00c2ec 100644
--- a/src/main/java/cpw/mods/fml/common/registry/FMLControlledNamespacedRegistry.java
+++ b/src/main/java/cpw/mods/fml/common/registry/FMLControlledNamespacedRegistry.java
@@ -356,7 +356,9 @@
 		}
 		if (getId(thing) >= 0) // duplicate object
 		{
-			throw new IllegalArgumentException(String.format("The object %s has been registered twice, using the names %s and %s.", thing, getNameForObject(thing), name));
+			int foundId = getId(thing);
+			Object otherThing = getRaw(foundId);
+			throw new IllegalArgumentException(String.format("The object %s{%x} has been registered twice, using the names %s and %s. (Other object at this id is %s{%x})", thing, System.identityHashCode(thing), getNameForObject(thing), name, otherThing, System.identityHashCode(otherThing)));
 		}
 		if (GameData.isFrozen(this))
 		{
diff --git a/src/main/resources/fmlversion.properties b/src/main/resources/fmlversion.properties
index 517da03..1ea4e66 100644
--- a/src/main/resources/fmlversion.properties
+++ b/src/main/resources/fmlversion.properties
@@ -1,6 +1,6 @@
 fmlbuild.major.number=7
 fmlbuild.minor.number=2
-fmlbuild.revision.number=188
-fmlbuild.build.number=34
+fmlbuild.revision.number=190
+fmlbuild.build.number=35
 fmlbuild.mcversion=1.7.2
 fmlbuild.mcpversion=9.03