Re: Attaching context info to an error

[Stefan Monnier <monnier@iro.umontreal.ca>]

> Just to be clear what I meant by this to those unfamiliar with
> Common Lisp and interactive restarts.  It means I can invoke
> the restart interactively from the Common Lisp debugger that
> is invoked as the last step of the non-returning error.
>
> 'baz' will be called again and again with different arguments
> and always errors until I recompile it to something else that
> doesn't error, which I can do while the debugger is active.
>
> I expected to be able to do the same from the Emacs Lisp
> debugger-mode/backtrace-mode *Backtrace* buffer, but I never
> get one such buffer.

FWIW, it works for me (with an Emacs compiled from the
`scratch/handler-bind` branch).
when I do `C-x C-e` at the end of `(foo)`, I get into the debugger, and
I do

    M-: (funcall (nth 2 (car pm/restarts))) RET

I get back into the debugger but with a different gensymd symbol.
And if I redefine `baz` to something that doesn't signal an error,

    M-: (funcall (nth 2 (car pm/restarts))) RET

then lets me return to the toplevel.


        Stefan