--- old/src/java.base/share/classes/java/lang/module/InstalledModuleFinder.java	Tue Mar  8 21:59:06 2016
+++ new/src/java.base/share/classes/java/lang/module/InstalledModuleFinder.java	Tue Mar  8 21:59:06 2016
@@ -110,7 +110,7 @@
                 md = ModuleDescriptor.read(imageReader.getResourceBuffer(location));
             }
             if (!md.name().equals(mn))
-                throw new InternalError();
+                throw new InternalError(md.name() + " is not equal to " + mn);
 
             // create the ModuleReference