gistfile1.rb

#!/usr/bin/env ruby
#
mock_dist = {
  :arch => "i386",
  :distribution => "epel",
  :release => "6",
}

mock_arch = mock_dist[:arch]
mock_dist = mock_dist[:distribution]
mock_rel = mock_dist[:release]

[mock_arch, mock_dist, mock_rel].each do |m|
  puts "#{m}"
end

$ ./tmp/test.rb
./tmp/test.rb:11:in `[]': no implicit conversion of Symbol into Integer (TypeError)
        from ./tmp/test.rb:11:in `<main>'