Left file: appwork-v1_5_2/rails-starter/config/initializers/backtrace_silencers.rb  
Right file: appwork-v1_6_0/rails-starter/config/initializers/backtrace_silencers.rb  

1	# Be sure to restart your server when you modify this file.	=	1	# Be sure to restart your server when you modify this file.
2			2
3	# You can add backtrace silencers for libraries that you're using but don't wish to see in your backtraces.		3	# You can add backtrace silencers for libraries that you're using but don't wish to see in your backtraces.
4	# Rails.backtrace_cleaner.add_silencer { |line| line =~ /my_noisy_library/ }	<>	4	# Rails.backtrace_cleaner.add_silencer { |line| /my_noisy_library/.match?(line) }
5		=	5
6	# You can also remove all the silencers if you're trying to debug a problem that might stem from framework code.	<>	6	# You can also remove all the silencers if you're trying to debug a problem that might stem from framework code
			7	# by setting BACKTRACE=1 before calling your invocation, like "BACKTRACE=1 ./bin/rails runner 'MyClass.perform'".
7	# Rails.backtrace_cleaner.remove_silencers!		8	Rails.backtrace_cleaner.remove_silencers! if ENV["BACKTRACE"]