From: Joel VanderWerf <vjoel@...>
Date: 2005-08-11T14:47:11+09:00
Subject: Re: Bindings at the time of Exceptions

Adam Sanderson wrote:
> I always thought it would be neat to be able to get the binding at the
> time an exception was raised so that one could see the state the stack
> was in when an exception occurred.
> 
> It would be nice list the local variables and values at the time of the
> exception for instance.  Can anyone think of some trickery to do this?
> I think it would be  of great use for debugging and whatnot, and
> massive points for cool ruby hackery ;)
>   .adam sanderson
> 

No trickery, but you do have to have the cooperation of the code which
raises:


def foo
  a = "value of a"
  raise StandardError, binding
end

def bar
  foo
rescue => e
  return e.message
end

b = bar

p b

p eval("a", b)
p eval("local_variables", b)

__END__

output:

#<Binding:0xb7e31a5c>
"value of a"
["a"]


-- 
      vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407