capistrano/capistrano — pull request #803 by seenmyfate (2013-11-22 15:51:41+00:00)
Title: Allow roles to be fetched with an array

For the case where the array may be stored in a variable, for example:

set :my_roles, [:app, :web]

on roles fetch(:my_roles) do
#
end

This will allow https://github.com/capistrano/rails/pull/30 to be
refactored