[Sbcl-help] Debugging and stepping in Slime

[Teemu L. <tli...@ik...>]

I'm trying Slime's and SBCL's debugger and stepping features but it
seems only half working. Here's one error which I see often.


    CL-USER> (defun foo () "foo")
    FOO
    CL-USER> (step (foo))


Now Slime's debugger opens with stepping options. There's instantly a
huge error message in the minibuffer (and *Messages* buffer):


    Error: Don't know how to use a DEBUG-SOURCE without a namestring or
           a form. This is probably a bug in SBCL itself.
           (Alternatively, SBCL might have been corrupted by bad user
           code, e.g. by an undefined Lisp operation like (FMAKUNBOUND
           'COMPILE), or by stray pointers from alien code or from
           unsafe Lisp code; or there might be a bug in the OS or
           hardware that SBCL is running on.) If it seems to be a bug in
           SBCL itself, the maintainers would like to know about it. Bug
           reports are welcome on the SBCL mailing lists, which you can
           find at <http://sbcl.sourceforge.net/>.


What does that mean? Is there a problem in SBCL? I'm using SBCL
1.0.49.65-a3c77b1.