Rails master (5.0) depends on Rack master (2.0). Actual fix in Appraisals this time.

Author: jeremy

Appraisals

@@ -38,6 +38,7 @@ appraise "rails-4-2" do
 end
 
 appraise "rails-edge" do
-  gem "rails", github: "rails/rails"
-  gem "arel", github: "rails/arel"
+  gem "rails",  ">= 5.0.0.alpha", github: "rails/rails"
+  gem "arel",   ">= 7.0.0.alpha", github: "rails/arel"
+  gem "rack",   ">= 2.0.0.alpha", github: "rack/rack"
 end

gemfiles/rails_edge.gemfile

@@ -6,8 +6,8 @@ gem "rake"
 gem "mocha", :require => false
 gem "appraisal"
 gem "pry"
-gem "rails", :github => "rails/rails"
-gem "arel", :github => "rails/arel"
-gem "rack", :github => "rack/rack"
+gem "rails", ">= 5.0.0.alpha", :github => "rails/rails"
+gem "arel", ">= 7.0.0.alpha", :github => "rails/arel"
+gem "rack", ">= 2.0.0.alpha", :github => "rack/rack"
 
 gemspec :path => "../"