Warning in console

After the gem is added to the Gemfile starting console gives the message

irb: warn: can't alias context from irb_context.

Gemfile at the moment

source 'https://rubygems.org'

ruby '2.1.2'

# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
gem 'rails', '4.1.5'
# Use postgresql as the database for Active Record
gem 'pg'

# assets
# Use SCSS for stylesheets
gem 'sass-rails', '~> 4.0.3'
# Use Uglifier as compressor for JavaScript assets
gem 'uglifier', '>= 1.3.0'
gem 'compass-rails'
gem 'fancy-buttons'
# Use CoffeeScript for .js.coffee assets and views
gem 'coffee-rails', '~> 4.0.0'
# See https://github.com/sstephenson/execjs#readme for more supported runtimes
gem 'therubyracer',  platforms: :ruby
# Use jquery as the JavaScript library
gem 'jquery-rails'

# Turbolinks makes following links in your web application faster. Read more: https://github.com/rails/turbolinks
gem 'turbolinks'

# auth
gem 'authlogic'
gem 'cancancan'

# views
# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
gem 'jbuilder', '~> 2.0'
gem 'haml-rails'
gem 'simple_form'
gem 'wice_grid'

# Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
gem 'spring',        group: :development

group :development do
  # i18n
  gem 'active_record_model_and_rspec_enhanced_templates'
  gem 'advanced_haml_scaffold_generator'
  gem 'factory_girl_fixtures_template'
  gem 'i18n_scaffold_controller_template'
  gem 'i18n_scaffold_generator'
  gem 'i18n_yaml_sorter', require: false
  gem 'jbuilder_rspec_generator'
  gem 'rspec_rails_scaffold_templates'
  gem 'translations_sync'

  # docs
  # bundle exec rake doc:rails generates the API under doc/api.
  gem 'sdoc', '~> 0.4.0',          group: :doc
end

group :test, :development do
  gem 'factory_girl_rails'
  gem 'guard'
  gem 'guard-rspec'
  gem 'quiet_assets'
  gem 'rspec-activemodel-mocks'
  gem 'rspec-rails'
  gem 'zeus', require: false

  # Metrics
  gem 'rubocop', require: false
  gem 'brakeman', require: false
end

group :test do
  gem 'capybara'
  gem 'database_cleaner'
  gem 'email_spec'
  gem 'poltergeist'
  gem 'shoulda-matchers'
end

Start by reproducing the warning when starting the console with the provided Gemfile, which uses Ruby 2.1.2, Rails 4.1.5, and rspec-activemodel-mocks. Trace which dependency emits the IRB alias warning and confirm the console starts without it; the issue does not mention a source file or test.