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The <a href="https://rubygems.org/search?utf8=%E2%9C%93&query=ruby-debug-base" rel="nofollow">ruby-debug-base</a> gem adds a binding_n method to the Kernel module and this will give you access binding object that can be used in an eval to give access to call-stack variables. Remember to issue Debugger.start to turn on call stack tracking. Here is an example showing its use to introspect what is going on inside irb (a Ruby program). One could put the require's and Debugger.start inside your own Ruby code as well. <pre><code>$ irb ruby-1.8.7-p302 > require 'rubygems' => true ruby-1.8.7-p302 > require 'ruby-debug-base' => true ruby-1.8.7-p302 > Debugger.start => true ruby-1.8.7-p302 > puts caller /tmp/.rvm/rubies/ruby-1.8.7-p302/lib/ruby/1.8/irb/workspace.rb:52 :i n `irb_binding' #` /tmp/.rvm/rubies/ruby-1.8.7-p302/lib/ruby/1.8/irb/workspace.rb:52 => nil ruby-1.8.7-p302 > eval "main", binding_n(2) => #<Object:0xb7762958 @prompt={:PROMPT_I=>"ruby-1.8.7-p302 > ", :PROMPT_N=>" ruby-1.8.7-p302 ?> ", :PROMPT_S=>"ruby-1.8.7-p302%l> ", :PROMPT_C=>"ruby-1.8.7-p302 > ", :AUTO_INDENT=>true, :RETURN=>" => %s \n"}> ruby-1.8.7-p302 > </code></pre> If you are willing to run a patched version of Ruby for 1.9.2 see <a href="http://gitnub.com/rocky/rb-threadframe" rel="nofollow">http://gitnub.com/rocky/rb-threadframe</a> for what I think is better access to the call stack. <a href="http://rubini.us" rel="nofollow">Rubinius</a> provides this capability built in via Rubinius::VM.backtrace.
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