Keep your 'debugger' statements in even when testing on hosts lacking the gem

toujours-debugger.rb

#
# This snippet allows you to sprinkle your code with #debugger references
# even if the ruby-debug gem isn't installed (or there's some other error
# encountered loading it).
#
begin
  require('ruby-debug')
  Debugger.start
rescue Exception => e
  unless (Kernel.method_defined?(:debugger))
    Kernel.module_eval do
      define_method(:debugger) do
        msg = ("#{$0}: ruby-debug gem not loaded, debugger not available\n" +
               "\t#{e.class.name}: #{e.message}\n" +
               "\t")
        warn(msg + caller.first)
        return nil
      end
      module_function(:debugger)
    end
  end
end