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Fix backwards compatibility with Rails 3 apps.
When we removed script/rails and introduced bin/rails, we accidentally introduced a regression. If you install Rails 4 as a gem, then try to do something in a Rails 3 application: $ rails g This will throw the 'please type rails new foo' message rather than the proper generator documentation message. This is because older apps don't have bin/rails. Therefore, we now *prefer* bin/rails, but still search for script/rails, and exec the one we find.
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