Iterate through an array while rescuing exceptions

tilt.rb

# https://github.com/rtomayko/tilt/blob/master/lib/tilt.rb

# Try each of the classes until one succeeds. If all of them fails,
# we'll raise the error of the first class.
first_failure = nil

klasses.each do |klass|
  begin
    klass.new { '' }
  rescue Exception => ex
    first_failure ||= ex
    next
  else
    return klass
  end
end

raise first_failure if first_failure

This seems like a good example of iterating through a list of options and trying each one, rescuing exceptions as we go. The first_failure gets stored and returned to the user if all fail. In an ideal situation the exceptions should be gathered and appropriate error messages bubbled up to the UI.