Merge pull request #9452 from YorickPeterse/master

Only load byebug on MRI

Gemfile

@@ -227,7 +227,7 @@ end
 
 group :development, :test do
   gem 'awesome_print'
-  gem 'byebug'
+  gem 'byebug', platform: :mri
   gem 'fuubar', '~> 2.0.0'
   gem 'pry-rails'