backtrace come out in large quantities in and pry + rcodetools have pry-debugger

[akicho8]

$ gem uninstall pry pry-debugger rcodetools

$ gem i pry rcodetools
Successfully installed pry-0.9.12
Successfully installed rcodetools-0.8.5.0

$ echo "require 'pry'; :ok # =>" > a.rb

$ ruby -S xmpfilter a.rb
require 'pry'; :ok # => :ok

$ gem i pry-debugger
Successfully installed pry-debugger-0.2.1

$ ruby -S xmpfilter a.rb
require 'pry'; :ok # => :ok
# ~>    from -:1:in `<main>'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:35:in `require'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:110:in `rescue in require'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:110:in `require'
# ~>    from /usr/local/rvm/gems/ruby-1.9.3-p286/gems/pry-0.9.12/lib/pry.rb:267:in `<top (required)>'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:45:in `require'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:45:in `require'
# ~>    from /usr/local/rvm/gems/ruby-1.9.3-p286/gems/pry-0.9.12/lib/pry/cli.rb:94:in `<top (required)>'
# ~>    from /usr/local/rvm/gems/ruby-1.9.3-p286/gems/pry-0.9.12/lib/pry/cli.rb:38:in `add_plugin_options'
# ~>    from /usr/local/rvm/gems/ruby-1.9.3-p286/gems/pry-0.9.12/lib/pry/cli.rb:38:in `each'
# ~>    from /usr/local/rvm/gems/ruby-1.9.3-p286/gems/pry-0.9.12/lib/pry/cli.rb:39:in `block in add_plugin_options'
# ~>    from /usr/local/rvm/gems/ruby-1.9.3-p286/gems/pry-0.9.12/lib/pry/plugins.rb:38:in `load_cli_options'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:45:in `require'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:45:in `require'
# ~>    from /usr/local/rvm/gems/ruby-1.9.3-p286/gems/pry-debugger-0.2.1/lib/pry-debugger/cli.rb:14:in `<top (required)>'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:58:in `require'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:58:in `require'
# ~>    from /usr/local/rvm/gems/ruby-1.9.3-p286/gems/pry-debugger-0.2.1/lib/pry-debugger/pry_ext.rb:1:in `<top (required)>'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:58:in `require'
# ~>    from /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:58:in `require'
# ~> /usr/local/rvm/gems/ruby-1.9.3-p286/gems/pry-debugger-0.2.1/lib/pry-debugger/processor.rb:100: warning: (...) interpreted as grouped expression
# ~> /usr/local/rvm/rubies/ruby-1.9.3-p286/lib/ruby/site_ruby/1.9.1/rubygems/core_ext/kernel_require.rb:58: warning: loading in progress, circular require considered harmful - /usr/local/rvm/gems/ruby-1.9.3-p286/gems/pry-0.9.12/lib/pry.rb
(snip)

I do not know whether there is cause pry, rcodetools, the pry-debugger, which library. However, because they trace back I'm getting lots of pry-debugger is present, I posted here. I saved backtrace will not come out with.