[slime-devel] Re: slime-toggle-trace-fdefinition (C-c C-t) causes XEmacs to hang

[Luke Gorrie]

"Steven E. Harris" <seh at panix.com> writes:

> Luke Gorrie <luke at synap.se> writes:
> 
> > Is it possible to SIGINT the lisp process in cygwin? With the unix
> > build of CLISP that puts it into the debugger so you can see a
> > backtrace of where it's stuck.
> 
> The stack trace isn't all to informative, but this warning from
> *inferior-lisp* may be:
> 
> ,----
> | ;; Connection to Emacs lost.
> | ;; [READ from #<INPUT STRING-INPUT-STREAM>: #<PACKAGE SWANK> has no external symbol with name "TOGGLE-TRACE-FDEFINITION"]
> `----
> 
> Actually, I think I just found the problem. I had not reloaded the
> updated slime.el into my long-running XEmacs instance. Upon reload,
> tracing works as expected.

Actually this is a useful reminder that we should handle protocol
errors more gracefully. This case of the connection breaking if Emacs
sends a message that is not understood makes it hard if you want to
develop SLIME add-ons - you end up killing your connection if you try
to call your Lisp code but forgot to load it first.

Onto the todo list for now.