diff -r fb324242a675 -r 22b67b4cf067 jitcraft/Objects.h
--- a/jitcraft/Objects.h	Fri Jul 06 19:24:22 2012 -0400
+++ b/jitcraft/Objects.h	Sat Jul 07 01:45:33 2012 -0400
@@ -1,4 +1,5 @@
-/*
+/* vim: set ts=4 sw=4 tw=99 et:
+ *
  * Copyright (C) 2012 David Anderson
  *
  * This file is part of JITCraft.
@@ -76,6 +77,11 @@
     inline bool is(MapKind map);
 
     inline void write(Zone *zone, Object **ptr, Object *value);
+
+    static inline size_t offsetOfMap() {
+        // Wtf? Clang won't accept offsetof(Object, map_) here...
+        return 0;
+    }
 };
 
 // Maps describe the layout of GCObjects. Every GCObject requires a map.