[gambit-list] safe dynamic-wind
feeley at iro.umontreal.ca
Sun Jan 8 02:30:02 EST 2006
Christian, in general I agree with your analysis. This is a bug in
with-exception-catcher and the REPL. I have now changed it so that
the dynamic-wind stack is properly wound and unwound. This has
required the addition of the procedures ##continuation-[graft|return]-
I also uncovered a bug which caused the dynamic-environment (shown
with the ,e command) to be wrong in higher frames, and a bug in
dynamic-wind when re-entering the dynamic-wind.
On 7-Jan-06, at 10:24 AM, Christian wrote:
> So it helps as long as I don't short-cut away my continuation in
> the repl. It's also rather ugly that I don't immediately see the
> position of the code where the error happened when being thrown
> into the debugger.
I don't understand. What is ugly? You know about the ,y REPL
command. Do you mean you would like the system to implicitly execute
this command when a new REPL is started? I'm not convinced this is
useful because the error message contains all this information, but
in a different (more novice friendly) format.
> (For inspecting the lexical environment of the place where the
> debugger happens I'll also step one up, and then it's too easy to
> forget to step back before continuing.)
> At least for the repl, efficiency is no concern - could it be
> changed to use safe continuations?
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