Opened an issue against rabl:

https://github.com/nesquena/rabl/issues/669

Here's the full error in Jenkins:

18:27:57 rake aborted!
18:27:57 SyntaxError: /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/rabl-0.13.0/lib/rabl/digestor.rb:6: syntax error, unexpected ','
18:27:57       def self.digest(name:, finder:, **options)
18:27:57                             ^
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/rabl-0.13.0/lib/rabl/digestor.rb:31: syntax error, unexpected keyword_elsif, expecting keyword_end
18:27:57     elsif Gem::Version.new(Rails.version) >= Gem::Version.new('4.1')
18:27:57          ^
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/rabl-0.13.0/lib/rabl/digestor.rb:60: syntax error, unexpected keyword_end, expecting end-of-input
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `require'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `block in require'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:240:in `load_dependency'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/activesupport-4.2.6/lib/active_support/dependencies.rb:274:in `require'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/rabl-0.13.0/lib/rabl.rb:21:in `<top (required)>'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/bundler-1.12.5/lib/bundler/runtime.rb:86:in `require'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/bundler-1.12.5/lib/bundler/runtime.rb:86:in `block (2 levels) in require'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/bundler-1.12.5/lib/bundler/runtime.rb:81:in `each'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/bundler-1.12.5/lib/bundler/runtime.rb:81:in `block in require'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/bundler-1.12.5/lib/bundler/runtime.rb:70:in `each'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/bundler-1.12.5/lib/bundler/runtime.rb:70:in `require'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/bundler-1.12.5/lib/bundler.rb:102:in `require'
18:27:57 /var/lib/workspace/workspace/test_develop_pr_core/database/mysql/label/fast/ruby/2.0.0/config/application.rb:36:in `<top (required)>'
18:27:57 /var/lib/workspace/workspace/test_develop_pr_core/database/mysql/label/fast/ruby/2.0.0/Rakefile:1:in `require'
18:27:57 /var/lib/workspace/workspace/test_develop_pr_core/database/mysql/label/fast/ruby/2.0.0/Rakefile:1:in `<top (required)>'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/gems/rake-11.2.2/exe/rake:27:in `<top (required)>'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/bin/ruby_executable_hooks:15:in `eval'
18:27:57 /usr/local/rvm/gems/ruby-2.0.0-p353@test_develop_pr_core-2/bin/ruby_executable_hooks:15:in `<main>'
18:27:57 (See full trace by running task with --trace)