Rails backtrace silencers do not work, while filters do

Question

Fresh Rails 4.2 set up. I want to suppress long error backtraces. In the following backtrace log first line would be enough for me, and next 4 could be removed

Answer 1

Remove default silencers before add own:

Rails.backtrace_cleaner.remove_silencers!
Rails.backtrace_cleaner.add_silencer { |line| line =~ /lib/ }