--- old/src/cpu/zero/vm/register_zero.cpp	2013-08-19 16:51:31.000000000 -0700
+++ new/src/cpu/zero/vm/register_zero.cpp	2013-08-19 16:51:30.000000000 -0700
@@ -32,8 +32,10 @@
 
 const char* RegisterImpl::name() const {
   ShouldNotCallThis();
+  return NULL;
 }
 
 const char* FloatRegisterImpl::name() const {
   ShouldNotCallThis();
+  return NULL;
 }