+changes relative to sbcl-1.0.57:
+ * enhancement: SB-EXT:ATOMIC-UPDATE makes it easy to perform non-destructive
+ updates of CAS-able places (similar to Clojure's swap!).
+ * bug fix: potential for infinite recursion during compilation of CLOS slot
+ typechecks when dependency graph had loops. (lp#1001799)
+ * bug fix: error forms reported with some program-errors were not escaped
+ properly.
+
+changes in sbcl-1.0.57 relative to sbcl-1.0.56: