lookup

# File railties/lib/rails/command/behavior.rb, line 76
          def lookup(namespaces)
            paths = namespaces_to_paths(namespaces)

            paths.each do |raw_path|
              lookup_paths.each do |base|
                path = "#{base}/#{raw_path}_#{command_type}"

                begin
                  require path
                  return
                rescue LoadError => e
                  raise unless e.message =~ /#{Regexp.escape(path)}$/
                rescue Exception => e
                  warn "[WARNING] Could not load #{command_type} #{path.inspect}. Error: #{e.message}.\n#{e.backtrace.join("\n")}"
                end
              end
            end
          end