Redefining Kernel module

exceptions.rb

class MyError < StandardError
end

module Kernel
  def raise(*args)

    # debugging...
    puts "RAISE REDEFINED, and these are the *args:"
    puts *args.inspect

    if args[0] == MyError
      puts "A MyError was raised. Nothing else must happen." 
      return
    else
      # fallback to default behaviour
      Kernel.raise(*args)
    end
  end
end

# raise Exception, "A message."       # normal behaviour
raise MyError, "This is my error."  # doesn't actually raise an exception :)
puts "You should be able to read this because the exception wasn't raised!"