* Terje Norderhaug [2010-03-21 20:39+0100] writes:
Six swank back-ends implement the RESTART-FRAME interface. Yet only two of these back-ends implements FRAME-RESTARTABLE-P, which is used by the BACKTRACE slimefun to identify whether a frame is restartable.
Allegro and SBCL implement both restart-frame and frame-restartable- p. ABCL, CCL, CLISP and LispWorks only implement restart-frame.
ABCL doesn't support it; the code is just a comment. CCL only on PPC. CLISP or LispWorks have no documented debugger API and without knowing the internals it's hard to say anything other than "may or may not work".
For consistency, perhaps back-ends that implement restart-frame also could implement frame-restartable-p?
They can but it shouldn't be required. The default implementation seems good enough to me.
Helmut