foo.rb

#!/usr/bin/env ruby
# vim:set fileencoding=utf-8 filetype=ruby
$KCODE = 'u'

require 'rubygems'
require 'logger'

def log_exception(logger, message)
  raise "Catch me."
rescue Exception => why
  puts "-" * 80
  puts "| #{message}"
  puts "-" * 80
  logger.debug(why)
end

logger = Logger.new($stdout)
log_exception(logger, "before loading ActiveSupport")

require 'active_support'

logger = Logger.new($stdout)
log_exception(logger, "after loading ActiveSupport")

buf_logger = ActiveSupport::BufferedLogger.new($stdout)
log_exception(buf_logger, "with ActiveSupport::BufferedLogger")