Frame-restartable-p is not defined in openmcl-swank.lisp and thus always returns NIL. This seems like an omission given that return- from-frame and restart-frame recently were added:
+2009-05-17 Helmut Eller heller@common-lisp.net + * swank-openmcl.lisp + (return-from-frame, restart-frame)
-- Terje Norderhaug