Disallowing double-raise

no_double_raisable.rb

require 'English'

module NoDoubleRaisable
  def error_handled!
    $ERROR_INFO = nil
  end
  
  def raise(*args)
    if $ERROR_INFO && args.first != $ERROR_INFO
      warn "Double raise at #{caller.first}, aborting."
      exit! false
    else
      super
    end
  end
end

class Object
  include NoDoubleRaisable
end

if $0 == __FILE__
  begin
    raise 'Initial failure'
  rescue
    # error_handled!
    raise 'Secondary failure'
  end
end