Sample script demonstrating a warning that listen 2.3.0 displays when stopping a second Listen instance

gistfile1.rb

# Using Ruby 2.0.0p195 and listen 2.3.0

require 'listen'

listener1 = Listen.to('dir1')
listener2 = Listen.to('dir2')

listener1.start
listener2.start

begin
  listener1.stop
rescue SystemExit
  puts "listener1: Eat #{$!.class} exception"
end
begin
  listener2.stop
rescue SystemExit
  puts "listener2: Eat #{$!.class} exception"
end

puts "Done!"

# The following appears in the console.  Warning is triggered by stopping the second listner (line 17).
#
# listener1: Eat SystemExit exception
# [Listen warning]: Change block raised an exception: actor already terminated
# Backtrace:
#   /Users/blue39/.rvm/gems/ruby-2.0.0-p195@listen_test/gems/celluloid-0.15.2/lib/celluloid/proxies/actor_proxy.rb:66:in `terminate!'
#   /Users/blue39/.rvm/gems/ruby-2.0.0-p195@listen_test/gems/celluloid-0.15.2/lib/celluloid/proxies/actor_proxy.rb:59:in `terminate'
#   /Users/blue39/.rvm/gems/ruby-2.0.0-p195@listen_test/gems/listen-2.2.0/lib/listen/listener.rb:158:in `_terminate_actors'
#   /Users/blue39/.rvm/gems/ruby-2.0.0-p195@listen_test/gems/listen-2.2.0/lib/listen/listener.rb:141:in `_wait_for_changes'
#   /Users/blue39/.rvm/gems/ruby-2.0.0-p195@listen_test/gems/listen-2.2.0/lib/listen/listener.rb:40:in `block in start'
# Done!