-(defmacro def-alloc (name words variable-length-p header lowtag inits)
- `(%def-alloc ',name ,words ,variable-length-p ,header ,lowtag ,inits))
+(defmacro def-alloc (name words alloc-style header lowtag inits)
+ `(%def-alloc ',name ,words ,alloc-style ,header ,lowtag ,inits))
+#!+compare-and-swap-vops
+(defmacro def-casser (name offset lowtag)
+ `(%def-casser ',name ,offset ,lowtag))