gistfile1.rb

require 'ruby-debug'

module Debugger

  class << self
    def post_mortem
        self.post_mortem = true
        debug_at_exit do
          handle_post_mortem($!) if $! && post_mortem?
        end
    end

    def handle_post_mortem(exp)
      return if !exp || !exp.__debug_context ||
        exp.__debug_context.stack_size == 0
      Debugger.suspend
      orig_tracing = Debugger.tracing, Debugger.current_context.tracing
      Debugger.tracing = Debugger.current_context.tracing = false
      Debugger.last_exception = exp
      doit(exp)
    ensure
      Debugger.tracing, Debugger.current_context.tracing = orig_tracing
      Debugger.resume
    end
  end
end

def doit(exp)
      context = exp.__debug_context
      p exp.__debug_file
      p context.stack_size
      p context.dead?
      file = context.frame_file(0)
end

Debugger.start({:post_mortem => true})

[1,1,1,0,1,1,1].each do |i|
    1/i
end