Totally pointless file handling example to show how I'd use exceptions with retry and ensure

gistfile1.rb

class NotExecutable < RuntimeError; end
begin
  f = File.open("test")
  raise NotExecutable unless File.executable?(f)
rescue Errno::ENOENT => e
  puts e.inspect
  %x{touch test}
  retry
rescue NotExecutable => e
  %x{chmod +x test}
  retry
rescue StandardError => e
  puts "Unhandled Exception: #{e}"
  puts e.backtrace  
ensure
  f.close rescue true
end