From: Dan Doel <djd15@...>
Date: 2004-04-05T00:41:03+09:00
Subject: Re: Any chance to see Exception#resume in Ruby2 ?

This probably isn't the safest way to do it, but it works. Note that if your
arguments to #raise are wrong, and it throws an ArgumentError, that
will get wrapped with a #resume method.  It's probably safer try and
handle all the possible argument combinations to #raise properly, but
this way is a lot easier for a proof-of-concept.

Enjoy.

- Dan

[dolio 11:35:18 ~] $ cat prac.rb
#!/usr/bin/ruby

def recoverable_raise(*args)
        raise *args
rescue Exception => e
        callcc do |cc|
                scls = class << e; self; end
                scls.send(:define_method, :resume, lambda { cc.call })
                raise
        end
end

begin
        puts "foo"
        recoverable_raise "baz"
        puts "bar"
rescue Exception => e
        p e
        e.resume
end
[dolio 11:35:39 ~] $ ./prac.rb
foo
#<RuntimeError: baz>
bar
[dolio 11:36:00 ~] $