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If I put Rocco in any gem group that gets loaded with my application (such as dev or none), I get the following error (with newlines inserted for readability):
in `exists?': wrong number of arguments (0 for 1) (ArgumentError)
I can solve the issue by moving Rocco to a different gem group:
# in Gemfile:
group :docs do
gem 'rocco', '~> 0.6.0'
This is likely due to lib/rocco.rb including FileTest here: